The review contains spoilers. I didn't really like it, the only thing that made me not give it a worse rating was the final scene, but apparently it was the brother's imagination, although most likely the same thing happened later, so whatever, it saved things. I didn't like that the MC left the copulation for the end, he risked losing his little sisters and having another man take their virginity, I also didn't like that chiyori let herself be kissed by someone else rather than with her Onii-chan, but it was good to see that she was sincere and rejected that guy. It didn't serve as eithera jerk off or entertainment for me, at least the final scene of chapter two served as a warm up to the warm up.