..well, I can't tell if this is a fanservice...when the two girls make love, I just actually enjoyed it. I don't watch the episodes when the brother is there, for me the brother is just a supporting character and his not really needed to that anime. It's enough when just mitsuki and hiyori, they really like a couple for me. Anyway, it's up to you guys, watch it or not to watch it, I just want to share it to you. My favorite is episode 1, it's just a gift from my bf so I watch it without knowing that some episodes is 18 plus and we're lucky that my little sister didn't join us to watch it..