1. A photosensitive composition containing-
a resin which includes a structural unit A represented by Formula (1) or (2) and a structural unit B represented by Formula (3), (4), or (5); and
a radically polymerizable monomer,
^ wherein, in Formula (1), R" repreSe„ts a hydrogen atom or a hydrocarbon group R» R , and R eaeh independent represent a hydrocarbon gronp, which may be subaitated wrth a halogen atom and contain an oxygen atom, a hydrogen atom, or a hydroxyl group L' presents a single bond or a divalent linking group, X' represent a -O- gronp or a -NR*-group, and R" represents a hydrogen atom or a hydrocarbon group,
in Formula (2), R* represents a hydrogen atom or a hydrocarbon group R» represents a hydrocarbon group, which may be substituted with a halogen atom and contain an oxygen atom, a hydrogen atom, or a hydroxyl group, R* md R* ^ independenfly represent a hydrocarbon group, which may be substituted with a halogen atom and contain an oxygen atom, a hydrogen atom, or a hydroxyl group or R» and R» are integrated ,o represent an oxygen atom, L> represents a single bond or a divafcn, Unking g^p, # represents , .0. group or a -NR-- group, and R» represents a hydrogen atom or a hydrocarbon gronp

in Formula (3), R3i represents a hydrogen atom or a hydrocarbon group L3 represents a single bond or a divalent linking group, and Cy> represents a hydrocarbon group which may contain an oxygen atom and has a cyclic structure,
in Formula (4), R« represents a hydrogen atom or a hydrocarbon group R« and R« each independently represent a hydrocarbon group which may contain an oxygen atom or a hydrogen atom, and R« and R« may be bonded to each other and form a ring, and
in Formula (5), R51 represents a hydrogen atom or a hydrocarbon group, R52 and R53 each independently represent a hydrogen atom or a hydrocarbon group, and R» md R53 may be bonded to each other and form a ring.
2. The photosensitive composition according to claim 1, wherein, in Formula (1),
R^ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R12, R13, and R14each independently represent a hydrocarbon group having 1 to 12 carbon atoms, which may be substituted with a halogen atom and contain an oxygen atom a hydrogen atom, or a hydroxyl group, V represents a single bond, an alkylene group having 1 to 3 carbon atoms, or a group represented by any one of Formulae (LI 1) to (L14), and R15 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, in Formula (2),
R^ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,
R22 represents a hydrocarbon group having 1 to 12 carbon atoms, which may be
substrtuted with a halogen atom and contain an oxygen atom, a hydrogen atom, or a hydroxyl
group,
R23 and R24each independently represent a hydrocarbon group having 1 to 12 carbon atoms, which may be substituted with a halogen atom and contain an oxygen atom a hydrogen atom, or a hydroxyl group or R23 a„d R24 are integrated tQ ^^ ^ atom,
L2 represents an alkylene group having 1 to 3 carbon atoms or a group represented by any one of Formulae (L21) to (L24), and
R25 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, in Formula (3),
R31 represents a hydrogen atom or an alky] group having 1 to 3 carbon atoms,

V represents a single bond, an alkylene group having 1 to 3 carbon atoms, or a group represented by any one of Formulae (L31) to (L34), and
Cy1 represents a hydrocarbon group which may contain an oxygen atom, has a cyclic structure, and has 3 to 20 carbon atoms,
in Formula (4),
R4' represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and
R42 and R43 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms or R* and R« are bonded to each other and represent a group represented by any one of Formulae (N41) to (N44), and
in Formula (5),
R^ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and
R52 and R53 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms or R» and R» are bonded to each other and represent a group represented by Formula (N51) or (N52),
wherein, in Formula (Lll), L represents an alkylene group having 1 to 3 carbon atoms, n represents an integer of 1 to 4, *1 represents a binding position with respect to X\ and *2 represents a binding position with respect to a carbon atom,
in Formula (L12), L represents an alkylene group having 1 to 3 carbon atoms, *1

represents a binding position with respect to X', and *2 represents a binding position with respect to a carbon atom,
in Formula (L13), V and V each independently represent an alkylene group having 1 to 3 carbon atoms, *1 represents a binding position with respect to X', and *2 represents a binding position with respect to a carbon atom,
in Formula (L14), *1 represents a binding position with respect to X1, and *2 represents a binding position with respect to a carbon atom,
in Formula (L21), L represents an alkylene group having 1 to 3 carbon atoms n represents an integer of 1 to 4, *1 represents a binding position with respect to X\ and *2 represents a binding position with respect to a carbon atom,
in Formula (L22), L represents an alkylene group having 1 to 3 carbon atoms *1 represents a binding position with respect to X\ and *2 represents a binding position with respect to a carbon atom,
in Formula (L23), V and V each independently represent an alkylene group having 1 to 3 carbon atoms, *1 represents a binding position with respect to X\ and *2 represents a binding position with respect to a carbon atom,
in Formula (L24), *1 represents a binding position with respect to X2, and *2 represents a binding position with respect to a carbon atom,
in Formula (L31), L represents an alkylene group having 1 to 3 carbon atoms n represents an integer of 1 to 4, *1 represents a binding position with respect to an oxygen atom, and *2 represents a binding position with respect to Cy1,
in Formula (L32), L represents an alkylene group having 1 to 3 carbon atoms *1 represents a binding position with respect to an oxygen atom, and *2 represents a binding position with respect to Cy1,
in Formula (L33), V and V each independently represent an alkylene group having 1 to 3 carbon atoms, *1 represents a binding position with respect to an oxygen atom, and *2 represents a binding position with respect to Cy1,
in Formula (L34), *1 represents a binding position with respect to an oxygen atom, and *2 represents a binding position with respect to Cy1,
in Formulae (N41) to (N44), *1 and *2 represent a binding position with respect to a nitrogen atom, and
in Formulae (N51) and (N52), *1 represents a binding position with respect to a nitrogen atom, and *2 represents a binding position with respect to a carbon atom

3. The photosensitive composition according to claim 1 or 2,
wherein the total content of the structural unit A and the structural unit B in the resin is 80% by mass or greater based on the total amount of the resin.
4. The photosensitive composition according to any one of claims 1 to 3,
wherein the proportion of the structural unit A in the total content of the structural unit A and the structural unit B in the resin is in a range of 10% by mass to 90% by mass.
5. The photosensitive composition according to any one of claims 1 to 4,
wherein the structural unit A is at least one structural unit C selected from the group consisting of a structural unit represented by Formula (1-1), a structural unit represented by Formula (1-2), a structural unit represented by Formula (1-3), a structural unit represented by Formula (1-4), a structural unit represented by Formula (1-5), a structural unit represented by Formula (1-6), a structural unit represented by Formula (1-7), a structural unit represented by Formula (1-8), and a structural unit represented by Formula (2-1).
6. The photosensitive composition according to any one of claims 1 to 5,
wherein the structural unit B is at least one structural unit D selected from the group consisting of a structural unit represented by Formula (3-3), a structural unit represented by

Formula (3-4), a structural unit represented by Formula (3-5), a structural unit represented by Formula (4-1), a structural unit represented by Formula (4-2), a structural unit represented by Formula (4-3), a structural unit represented by Formula (4-4), a structural unit represented by Formula (5-1), a structural unit represented by Formula (5-2), and a structural unit represented by Formula (5-3).
7. The photosensitive composition according to any one of claims 1 to 4,
wherein Cy< in Formula (3) includes a polycyclic structure as me cyclic structure and
R41 in Formula (4) represents a hydrogen atom.
8. The photosensitive composition according to any one of claims 1 to 7,
wherein the structural unit B includes at least one structural unit represented by Formula (3) and further includes at least one selected from the group consisting of structural units represented by Formulae (4) and (5).

9. The photosensitive composition according to any one of claims 1 to 8,
wherein the content of the resin is in a range of 0.5% by mass to 10.0% by mass based on the total amount of the photosensitive composition.
10. The photosensitive composition according to any one of claims 1 to 9,
wherein the radically polymerizable monomer includes a monofunctional radically polymerizable monomer.
11. An image forming method comprising:
an application process of applying an ink composition which is the photosensitive composition according to any one of claims 1 to 10 onto a recording medium according to an ink-jet method; and
an irradiation process of irradiating the ink composition applied onto the recording medium with active energy rays.
12. A film forming method comprising:
an application process of applying the photosensitive composition according to any one of claims 1 to 10 onto a substrate; and
an irradiation process of irradiating the photosensitive composition applied onto the substrate with active energy rays.
13. A resin comprising:
at least one structural unit C selected from the group consisting of a structural unit represented by Formula (1-1), a structural unit represented by Formula (1-2), a structural unit represented by Formula (1-3), a structural unit represented by Formula (1-4), a structural unit represented by Formula (1-5), a structural unit represented by Formula (1-6), a structural unit represented by Formula (1-7), a structural unit represented by Formula (1-8), and a structural unit represented by Formula (2-1); and
at least one structural unit D selected from the group consisting of a structural unit represented by Formula (3-3), a structural unit represented by Formula (3-4), a structural unit represented by Formula (3-5), a structural unit represented by Formula (4-1), a structural unit represented by Formula (4-2), a structural unit represented by Formula (4-3), a structural unit represented by Formula (4-4), a structural unit represented by Formula (5-1), a structural unit

represented by Formula (5-2), and a structural unit represented by Formula (5-3).
14. The resin according to claim 43,
wherein the structural unit D includes at least one selected from the group consisting of a structural unit represented by Formula (3-3), a structural unit represented by Formula (3-4), and a structural unit represented by Formula (3-5) and further includes at least one

selected from the group consisting of a structural unit represented by Formula (4-1), a structural unit represented by Formula (4-2), a structural unit represented by Formula (4-3), a structural unit represented by Formula (4-4), a structural unit represented by Formula (5-1),' a structural unit represented by Formula (5-2), and a structural unit represented by Formula (5-3).
15. A film containing:
the resin according to claim 13 or 14.