What kind of title is this?: Manga.
How many volumes are there?: 16 volumes are listed.
How many chapters are there?: 94 chapters are listed.
Where can I read it?: Reading links are listed for Official Site, K MANGA, Kodansha USA. Check availability in your region.

Synopsis

About Watari-kun's ****** Is about to Collapse

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: Includes two extra chapters.

Comedy Drama Romance Slice of Life