The hidden popular spot of the school, the night duty room! You can eat tea and sweets, and in winter there is a kotatsu to keep you warm! However, in the night duty room, the naive students were being fiddled with their naive cracks from the side of their bloomers and panties with the super-thick fingers of their lascivious teacher! At first, she laughed innocently, saying, "It's ticklish!", but after that, the naive student who became addicted to the pleasure of the crack escalated in a straight line to seek pleasure!