A high school boy, Touma Nijino, who has suffered two heartbreaks in a row, is welcomed into a new school year by his new teachers, his ex-girlfriends, who dumped him! The two, who still have lingering feelings for Touma, run into each other at his house. They managed to get Touma promise to treat them as teachers until he graduates, but-- "Hey, can I kiss you?" "Do you hate sleeping with me now?" They are both trying to develop love like a commuting wife to get ahead of each other at the same time--!? By day, they secretly approach him as teachers, and by night, they come on to him hard as ex-girlfriends! A semi-cohabiting romantic comedy with 2 slightly naughty ex-girlfriends!