I Love You! Romantic Confession Inside a Cave: Tall Tale (E15)

While Mr. Seta goes out for excavation, Keitaro baby-sits Sara. She pretends to be well-behaved, but soon revealed her real character while teasing Keitaro. She goes out of Keitaro's room and is chased by tenants in Hinata-sou. She is cornered in front of "a never-opened room". Suddenly its door is opened and Mr. Seta comes out from the room. (Prime Video)