A certain summer day. Hikari, who lives on the same floor, stood in the corridor with some trouble. It seems that the fan is out of order when I say hello. "Let's take a look at me?" I accepted it with a light feeling, with the intention of kindness. When I think about it, my husband is away from work and is in a room in a hot and humid housing complex. Hikari-san's open chest ... The dripping sweat is strangely erotic ... I had strange expectations.