At this point, did you try to talk to Maki from the back of the classrooms?
Viewing post in Heroes University H update 0.1.5.1 (Sports festival) comments
I think I have done all of the 3 main girls' events. (Maki is at the fountain with all of her replays viewable, Luna is at the Library with the "About Us" text option that doesn't do anything, and Angie is locked in her dorm after doing the grinding maid event. And I can view everyone's super suits.)
You may have found a bug that we missed. We would be very grateful if you could upload your save file(s) to this link so that we can analyze in depth what is causing the problem.
https://www.dropbox.com/request/iAEFvUrZelO5bsfafcoY
The save file is stored here:
Win: {Game_Folder}/saves/
Win: C:\Users\{user_name}\AppData\Roaming\RenPy\Heroes University H 0.1.5.1\
Android: /storage/emulated/0/Android/data/com.huh/files/saves/
Android: /storage/Android/data/com.huh/files/saves/
Mac: $HOME/Library/RenPy/Heroes University H 0.1.5.1