Can we talk about Haruna and Tachimukai for a moment ?
Cause they are so cute (not in a romantic sense), and so important to each other. When Tachimukai gets discouraged, Haruna is the one who comes to him, lets him rant, and then helps him. Also, they are one of the younger players, so it's just adds nicely, in my opinion. Tachimukai being embarrassed and annoyed with himself while Haruna doesn't see it, she genuinely sees a great player. She doesn't see him as Endou copy. She sees him as a talented, shy guy who is amazing at what he does.
Romantic or not, these two are absolutly a peak combo
The fact that they are both cutie pies and just never fell into that weird "boy x girl must have feelings for each other" dynamic that we kinda see with Endou and most girls is so important to me. They are genuinely best friends and that's so precious