I just started the second season and i was feeling angry because sergeant said eijun was only there to drive furuya so i looked up if eijun would ever be the ace since the show is called ace of diamond. i know i spoiled it for myself but i had to know- anyways after that i looked up why he became the ace because tbh i was confused lol. someone said that eijun and furuya are both like co aces which is what i was expecting but i didnt expect boss to give him the ace number. i know he worked really hard for it but i cant imagine furuya letting go of the ace jersey. that is all, thank you :)