Don't Call Me Your Teacher!(2006)

Senseitte Yobanaide!

Haruka Morikawa is a university student training to be a teacher, and her boyfriend, a fellow trainee, cheats on her. As Haruka drinks her sorrows away in a park, a hot guy just happens to be passing by and comes over to comfort her. The next day, when she's student-teaching at a local school - the same school her now ex-boyfriend is student-teaching at - she sees the guy from the night before in her classroom......! "Could it be that I forced my own student to do this and that with me!?" This is a love story full of passion that's sure to make your heart throb with envy!

(Source: Renta!)