Naoto Watari's life has revolved around his little sister. He forgoes club activities for the sake of spending time with her, leading many of his peers to label him a siscon. But as long as his sister's happy, Nao is willing to shut out any unwelcome comments about himself.

Naoto Watari has had his share of struggles: his parents died two years ago, and now he and his sister live at his aunt’s house. There, his desire to protect his sister earned him notoriety as “the guy with the sister complex”—which never mattered to him, as his sister always came first. But when Satsuki, a childhood friend-turned-enemy(?), becomes his school mate, Naoto’s ordinary life is thrown into chaos … and Satsuki may just be the beginning.
 
(Source: Kodansha USA)
 
Note: Total chapter count includes 2 extra chapters.

Naoto Watari has had his share of struggles: his parents died two years ago, and now he and his sister live at his aunt’s house. There, his desire to protect his sister earned him notoriety as “the guy with the sister complex”—which never mattered to him, as his sister always came first. But when Satsuki, a childhood friend-turned-enemy(?), becomes his school mate, Naoto’s ordinary life is thrown into chaos … and Satsuki may just be the beginning. 
 
(Source: Kodansha USA)

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