Enta is Kazuki's childhood friend and former soccer partner—the two made up what their team called the "golden duo" back in the day. He's got a thing for Kazuki that he keeps to himself, but what really drives him is wanting to get back on the field together. Kazuki spotted him alone once and just invited him to play, which kicked off their whole friendship.
Soccer matters to him. Like, seriously. He's the type who'll push Kazuki to step back up and reclaim what they had as a team, mostly because he genuinely believes they were unstoppable together. Beyond the sport, Enta's surprisingly thoughtful—when Kazuki's stressed about keeping secrets, Enta's usually the one reassuring him and making it clear their friendship isn't going anywhere. He's also taken it upon himself to look after Kazuki's brother, which says something about how much he cares about Kazuki's whole world.
Content compiled by AnimeList.moe from publicly available sources.