Shujinkou-sama no Imouto ni Aisareteiru kedo, Shikkari Yandere.

Story

High school boy Shinji Usui has a childhood friend named Hinata Ichinose — a guy who’s handsome and incredibly popular with girls, just like the hero of a rom-com. Being around Hinata, who’s as radiant and captivating as the sun, made Shinji feel pitiful by comparison, so at some point, he began to feel a bit uncomfortable around him. On the other hand, Hinata’s younger sister, Tsukina, treats him more kindly than she treats her own brother, for some reason.

Synopsis via AniList (English).

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