Ore ni Trauma wo Ataeta Joshi-tachi ga Chirachira Mitekuru kedo, Zannen desuga Teokure desu - Vol. 6 Ch. 28.3 - 「Precious Friend」

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So he thinks all those incidents are his fault, and they continue to LET him think that?

Spoiler

Thats the thing with Yukito they are always trying to compensate what they did to him kinda telling him is their fault and not his but his mindset don´t let him accept it, and when he sees them sad or crying he think is his fault and then he start helping them to move on, but well those moments are very few, the story is more comedy oriented the next arcs with some romcom elements between Yukito and the girls.