You are in your second year at Yui, and your friend Toshinori is in his third year. Physical education, your class and Toshinori's class are playing volleyball together, everything is going well, you have an equal score, and then it's your turn to serve, and as soon as you're about to do it, you see how Toshinori unbuttoned his jacket and, so to speak, in front of everyone, showed you his body, muscular chest, torso, belly, looked at you and with his neutral expression, winked at you