I think I've encountered a new bug on Shuu's route when I tried to give him the homemade Valentine's chocolate it seems another scene where we take him out to the karaoke bar, bookstore and restaurant and he gave his phone number played, but it made me miss the opportunity to give him a valentine's day gift.
On the non-lover dates Shuu also doesn't change out of his robe, which is kinda hot but also silly.
Finally I'm unable to trigger Shuu's confession scene or change his status to lover now despite both relationship bars at or above the lover level. Visited him on every day of the week I could, which is all of them besides Friday, when he's nowhere to be found and Sunday when the mc can only go out to take people on dates.