Rima, a student in Tamura's class, a boring math teacher, has poor grades and is at risk of repeating the year if things continue as they are. If a student from his class repeats the year, it will affect Tamura's own evaluation, so Tamura decides to give Rima a one-on-one remedial lesson for one week during the summer vacation. Rima, who shows no motivation to study, spreads her pussy lips and tries to seduce Tamura, her teacher, to get credits! Rima likes Tamura's dick and goes crazy in an empty school, not just for the credits...