Matsunaga (Kento Nakajima) knew that Miji (Hikari Takahashi) was working in the same place as Ling (Daisuke Fujiwara) without telling him, and mistakenly thought that the two were dating.Meiji wanted to clear up the misunderstanding and accidentally spoke her true feelings, but was saved by Ling who had an idea.Matsunaga also knew that he had guessed wrong about the relationship between the two...

A few days later, Miji made Valentine's Day chocolates for Matsunaga and accidentally learned that Matsunaga had dated the tenants of the shared house before.According to Kentaro (Koji Mukai), falling in love in a shared house is free, but according to the default rules, one person must leave when they become lovers. Matsunaga's former lover also left the shared house and went to the United States.However, now that her ex-girlfriend has returned to Japan, she feels an unspeakable uneasiness.

The newly appointed temporary homeroom teacher, Natsumi Kobayashi (Yumi Wakazuki), is worried about Miki, who has no energy at school.Xia Wei encouraged students who have a negative attitude toward love because they have no chance of winning, saying that if they don't face their feelings honestly, they will regret it. Meiji was also encouraged by this sentence.

Under such circumstances, Tomoko (Eimi Yuki) suddenly came from Wakayama to have a three-way relationship and moved into a shared house.Matsunaga came to Meiji's room to help organize it, but there were props and wrapping paper from making Valentine's Day chocolates scattered there -!