Koichi is a son of the Suzuki family. He is a hikikomori ("recluse") and dies suddenly. The rest of the Suzuki family, father Yukio, mother Yuko, and daughter Fumi, are confused. Especially the mother Yuko, who is shocked by the death of her son and loses her memory. Fumi lies to her mother and tells her that "Koichi stopped being hikikomori and now works in Argentina."