Shinobu raised her only son Mitsuo on her own.She was asked to work for her because New Year and Golden Week were "busy seasons", and she made Mitsuo feel lonely.One day like that...October comes when Shinobu's work is free.Shinobu is now able to take some time off and wants to do something with Mitsuo to atone for his sins, but he is undecided about what to do.Shinobu hears from Mitsuo that there is an event called Halloween in October.