Ryuunosuke started living by himself this summer while preparing for his entrance exams. He saw a woman in the street who was helping a mother and their child, and he was so captivated by her beauty that he also offered his help. They parted ways afterwards, but he found out later that Hinaki was actually the daughter of his next door neighbour and also his senpai at his school of choice.

He was delighted to have someone suiting his tastes so close to him. Moreover, she also became his private tutor to help bring up his grades. It was like a dream and he was motivated to pass his exam, but then one day she suddenly made a surprising request.

“Will you be my boyfriend?”

It was because she wanted a pretend boyfriend due to certain circumstances, but he readily agreed since he already had feelings for her. An older woman that became first his private tutor, and now his girlfriend. Thus begins their exciting and intimate co-habitation life.