Matsuzaka, a lonely single middle-aged man, witnesses an unbelievable sight in his apartment when he returns home from his security job! What a strange beauty is cleaning up the stairs! - It's also with no bra and no panties ... She seems to be a married woman who recently moved in next door called "Non". - A cute loose and fluffy face that heals just by looking at it, F-cup big breasts like marshmallows, and a glimpse of a beautiful pine ○ Ko. The appearance of an abnormal neighbor changes Matsuzaka's daily life completely!