More than a married couple, but not lovers.

Jirou Yakuin, a third-year high school student, is paired with Akari Watanabe for the school's "marriage practical" experiment. This involves randomly selecting boy-girl pairs to live as pretend married couples and monitor their interactions. Their goal is to earn points and potentially switch partners with the top-scoring couples, a prospect that seems more complicated when Jirou discovers his childhood friend Shiori Sakurazaka is paired with his crush, Minami Tenjin.