On the outside, Ren Fujimaru seems like the perfect actor—except for one flaw: he cannot handle working with children due to a past incident. For this reason, his manager proposes that he should live with his young costar Yuu Kusaka, his boss' son, for a week. Ren initially treats the idea as a joke, but he is shocked to discover that his manager is being serious: Yuu must stay with him in his apartment to improve their relationship. Having never lived with kids, Ren finds it difficult to strike up a conversation with Yuu.

Aid comes in the form of Yuu's manager Kei Haruo—a former child actor whom Ren admired as a kid. With his long-time idol so close, Ren cannot help but ask Kei about his sudden disappearance from the spotlight, but Kei refuses to give him any explanation.

Can the lives of these three people, each carrying their own burden, change in the spurt of just one week?