Hibiki Amamiya works for a company as a volleyball player. I often have to work overtime due to computer work that I am not used to...and suddenly it rains! Amemiya, who is left behind at the company with his girlfriend's senior colleague, reluctantly decides to let him stay at his home. Senpai, you're being rational, aren't you? I know it's no good, but... my colleague's defenseless, chewy breasts