Homemade Heroes

The children of the Sendai family - Retsuto, Akari, Marin and Mashiro - live in a very unusual home with their parents and grandfather. Below ground level, they have a command center, as well as R&D labs. The children are preparing to become heroes, in case a situation arises that can't be handled by the self-defense force or the police. Retsuto is enthusiastic about the idea, and Marin really loves ally-of-justice TV shows. Little Mashiro is skeptical about her ability to do anything as a 'hero.'