hello!! as of septemberish, miai and wataru started hanging out and miai occasionally comes over (mostly to visit tori tbh) - if hina lives with tori and wataru, then he's probably met her since iirc miai comes over for movie nights sometimes with wataru+tori.

he'd probably find her energy charming and would definitely encourage tori and hina to be friends (hits f for tori)-- he also likes to spoil people younger than him so he'd probably do the same with her, esp since she's wataru's little sis... always bringing gifts and sweets for tori and hina when he drops by !!