Finished this game, no major issue found, but i wonder who is picture "Other 98"? The picture still locked until now.
I know player never invite Mikoto to his mansion, but when I see player contact and Mikoto never answer player call make me feel like "Her event still not done yet". Well that's fine.
Lastly, you added "Completed" flag when all the events are done it's something that player want. I hope you keep this feature in your next game.