Sekai de Ichiban Dai Kirai

Kazuha Akiyoshi is the dependable eldest daughter of a household of six children, a charming tomboy who keeps her softer feelings carefully hidden. Everything starts to shift when she meets Mizushima, the first boy who actually treats her as a girl her own age, and she experiences a real crush for the first time. Complicating matters is Sugimoto, an older man who insists on staying close to her life despite being the very person Kazuha claims to detest more than anyone. The volume belongs to the wider Akiyoshi Family series, which collects related romantic stories spanning multiple installments and short pieces; among them is a tangent following Megumi, a girl trying to recover from a breakup whose path crosses with a blonde boy nursing his own heartbreak at a train station.