It's been five years since Mio and Shun came to stay with Shun's parents. By all accounts, their life is great. Shun has taken a temporary break from writing novels, and Mio is working as a mechanic. But with stability comes ennui, leading both to begin quietly questioning their relationship. And an even more turbulent storm is brewing, as Shun's now-teenage brother, Fumi, has entered a rebellious phase!