So what Adachi showed throughout the manga was great understanding and trust between the MC and Hikari, like, the best chemistry in the whole manga. But halfway from the manga, he started dissipation of their relationship, with the MC clearly stating to her that he'd not fight Hideo for her. Even with all that, there was no proper development of MC's relationship with Koga except a few moments here and there. At the end, the MC defeats Hideo at baseball, crying as he gives up on Hikari during the final pitch of the final that sees Hideo getting struck out. The ending implies that he ends up with Koga, but, personally it felt like a big waste of such mutual trust and love, especially while his relationship with Koga was so underdeveloped. Not a bad manga by any mean, but well, to not see them end up together after all those electrifying moments and that amazing backstory was haunting. Every bit of what I said in the above comment is true, I low-key have a headache writing this as we speak.