I downloaded the file and play it offline, and encountered the error at the scene of Mr. Ai saying goodbye to the class.
Thinking it was an error from my computer, I try to play it online on the browser version. But, I get the same result : the story ends abruptly at Mr. Ai's monologue and I can't click any button on the game.
Is it intentional and because the game still in development and you give us the brief introduction to the narration? or is it a bug in the game?
Anyway, it has a promising narrative and use enchanting art! Although, I hope there is a color code or effect to divine the dialog between MC and other characters ^^;