Tips for telling the girls apart
Akizono has round, circular glasses. Her hair is in a braid and has a hairpin in the front.
Sakuramachi has less round, closer to rectangular glasses. Her center bangs end in a point. Her hair flows straight and free.
Yomi's center bangs are straight, like a rectangle. Yomi has twin tails.
For the cosplay chapter, Sakuramachi changes her glasses and hair style, just remember Akizono has the wig on.