Eehhhhh... I'm not really digging any of the girls at the moment.
Gotou-san's design is the best but she's probably going to end up one of those "I'm so old, no one would like me, so I rejected your feelings because I know better than you." types, which is annoying and so much of a Culture dissonance that I have to constantly remind myself this shit is set in Japan where that's a thing apparently.
Mishima is feigning incompetence to either get out of work or suck up to the boss, both of which are annoying. Plus I don't care for her design.
Sayu is a contrived fantasy and it's hard to suspend my disbelief with her. Design is cute though.
And MC is a drama king and about as socially perceptive as a hungry baby.