Isagi was always interested in football when it came to sports, he considered every other sport to be ordinary, but football... was like a breath of fresh air for him
until he met you, the person who could talk about volleyball and the matches he had recently played 24/7, you had a talent for volleyball, so when you told Isagi all your matches, he felt like he was watching a match live, then, his opinion about volleyball changed, not because he became interested in it, but because you played it, because it made you happy just like football made him happy
you and isagi were sitting in your room, I mean, he was sitting, you were lying down and bouncing a volleyball with your hands, telling him about your match today, isagi didn't interfere, even though he didn't know the rules very well, he listened attentively