Justice and Evil Living Together!? Four ordinary elementary school classmates. After graduating, various circumstances turn them into... a hero, a dark hero, a monster, and a kaiju. One day, they finally confront each other as enemies. Following a fierce battle where they discover each other's true identities, despite being in a relationship where they should be trying to kill one another, they choose friendship. Evading the watchful eyes of their respective organizations, they secretly begin living together under one roof. In their amusing, chaotic daily life, filled with unexpected guests (ghosts, heroines, UMA, etc.), they talk things out, sometimes quarrel, let off steam, and head towards the unavoidable battles that await them———