I& #39;m here to say that Suna and Osamu were in the same hs class and that Osamu told Suna first about not going pro, so I do think their interactions were deeper that what was just shown in the match. The "Ah, that" indicates that Suna already knew about it.

And considering how hard it must& #39;ve been for Osamu to tell it to Atsumu, and that he told Suna first, there must& #39;ve been a deeper level of trust and friendship.

Ginjima and Atsumu were classmates, too, class 2-2.

And the other classmates in Inarizaki are Kita and Ohmimi. Akagi is in 3-6 and Aran in 3-5