Jin actually looked vaguely embarrassed at Ai's declaration. With all that was going on, this was was what she decided to focus on? Maybe it was the older girl's way of trying to be calm. "I... forgot, that's all. You can be Ai-sempai if it bugs you that much." A little smile lit their features. "I don't mind -kun, but only my aunt and uncle call me -chan. And they only get to do that because they feed me."

Jin wrapped a hand around the doorknob, sparing a glance back at Ryoma. "I can live with Takajin. Makes me sound tough." They'd never seen Ryoma smile so freely. It made his whole face different. Odd, that he could smile in these circumstances. Not all of the rumors surrounding him were false - he had to be tough as hell to summon a grin like that. 

"If you want, later..." Jin promised them all, silently praying, that there would be a 'later'. "Later I can help you brush up on the English. It's hard. Not impossible." With an exhale, Jin snapped their eyes to the door. "This... will also be hard." 

Holding up one hand, Jin counted down silently.

Three...

Two... 

ONE.

In one motion, Jin pulled the board and opened the door.