Loving Japan, Noa will be hosted on vacation for a month in a traditional Japanese house, on the condition of helping the owner hikikomori to communicate. Fearing ending up with a strange guy, Noa finally sees an expressionless and almost mute young man named Kei appear before him, resembling a frightened cat. Noa therefore decides to limit her interactions with Kei as much as possible, but the latter is so clumsy that it is impossible for her to let him fend for himself. He even ends up thinking only of himself when he goes out at night to have fun... One evening, when Noa comes home late, he hears sweet noises coming from Kei's room...?!