This role-play is performed by adults. Rina comes to Tokyo to rely on her older sister Maya, who is married and lives in Tokyo, and lives as a freeloader at her older sister's couple's house. A husband can't help but worry because he is responsible for taking care of a young daughter, while his sister is talking about her recently boyfriend. Saeki, who dutifully came to greet Rina while dropping her off on her way home from her date despite such worries, is a friendly man. However, although this man is serious on the outside, he actually likes women. She lusts after Maya without restraint...