Yeah. this is a contender for being one of the craziest, incomplete, lust filled dummies I have seen by far. The top for me is still OREIMO but this is creeping in very close to it. I spent an entire hour sharply reading up to chapter 18 and I refuse to bookmark! The story is becoming twisted beyond belief and turning into a naughty fantasy world with no care for serious things. You got these other girls being curious about sex but jesus christ, the flow of events is skipping too many steps? Too many plot holes and the fact he MC was willingly being overly intimate withthe sister despite not knowing she was un-related yet is wild. But the "GF" getting into off screen intercourse with the MC knowing they are blood related is just crazy and struck as SWEET HOME ALABAMA. It's clear to me the characters here all have distorted ideas of common sense and it's not a good influence to any audience.

I literally just watched a MC drive all night for his sister fueled by his naive love.

Why can't japanese people understand intercourse between blood related people cannot happen or the children will suffer from severe genetic deformities?