Genkai JK Kirimi Sanjuuni-sai

Keigo Kazami (28), a high school teacher with a fondness for older women, is homeroom teacher to a class that suddenly gains a transfer student—Kirimi Takanashi (32), an active actress and the mother of one!? Kirimi has been trying to convince her truant daughter to attend school, but the daughter fires back: "Did you go to high school? You were already working in show business." To persuade her daughter, Kirimi boldly declares that she'll enroll in high school herself first—and even rocks the school uniform with enthusiasm! Keigo is completely thrown off by having a student older than himself, but the principal orders him to support Kirimi's "fun" school life. Can Keigo fulfill his duties without being tempted by Kirimi's alluring maturity...?

(Source: Kadokawa, translated)