Since today is Chika's (who is genuinely one of my favorite characters) birthday and we're all supposed to be appreciating her I'm going to do just that.
One thing I like about her is that while she is obviously naive in that she doesn't see Sensei's infidelity, there is one perk. Rather than stressing about the concequences of her relationship, reliving past truamas, or creating new ones, she's living in the moment more than anyone else. She trying to be a good girlfriend now. Not just thinking about being one in the future. She's having kinky sex in weird places, organizing concensual threesomes, and reflecting on her role and impact in the relationship. Her romance aside, she still finds time to look out for her family and friends.
Chika is great and Sensei doesn't deserve her.
Also she's hot.