i feel like that natsumi girl is a little.... she knows a wee bit too much of the worlds darkness. The ayano girl on the other hand is.... too.... mature? and too... advanced? she understands too much. The mc instead feels... too detached... less human... not as a character in the story but as a person, i understand his backstory but it feels ike he has too much darkness in his heart and distrust to humans. i understand that liking younger girl far younger than you and plus underage is bad, tha main issue with the mc is not even that but THAT uncomfortable distance he puts against another person. its not really noticable when he's with others but when its with ayano its very glaring since she 'kinda' "liked" him. he is rejecting "her" 'distance', thats why its so glaring.... these characters with darkness in their heart, twisted... perspective on the world and distrust....
p.s. i know im ranting but i just want to... leave it here..
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FIGHT!