Kokuhaku Gokko

Iri and Yukimi have been best friends for two years, and they have something in common--both of them have crushes on two of the coolest guys in school! But they both decide to change that. Iri talks Yukimi into making a game out of it. They'll both do their best to confess their feelings to their crushes and see what happens. But then, Iri begins to make more progress than Yukimi...?

Also contains:
Hito o suki ni naru kimochi
Kimi no sonzai.
Koi.

(Source: MU)