Takaya Yamauchi

A Japanese family acquires an undead domestic servant whose presence begins to affect their daily lives.

A factory town is covered by chimney smoke, and as the townspeople haven't see the sky in centuries, they no longer believe that stars exist. A chimney sweep and a friendly monster named Poupelle decide to prove that stars are real.

Hajime, a postman, wakes up with amnesia after Valentine's Day. Reika has clues about his lost memories from that day. He tries to solve the mystery of his forgotten Valentine's Day events while their paths cross.