Ch. 1-2: In elementary school, Haru confessed to his older brother Aki, but after 5 years, Haru is still the height of an elementary schooler, making him feel insecure
Ch. 3: Roommates Satoshi and Atsuto are celebrating Satoshi's 30th birthday, when he suddenly becomes a wizard. Then, Satoshi reveals it's Atsuto's fault he never lost his virginity
Ch. 4-5: After seeing popular, aloof senpai Sakuma accidentally put on colored lip cream, Akiyoshi begins to find him cute and has fun teasing him
Kashiwagi Kyoudai no Renai Jijou