TPIN-093 College club love triangle at a countryside inn with the hostess and a co-worker

The narrator returns to his sister-in-law Kyoko's guesthouse in the countryside, where he works during holidays. His university club friends join him this year, and he finds himself torn between Kyoko, an older woman and childhood friend, and a female club member. He has a girlfriend in Tokyo, but the two women at the inn pull him into a secret affair.