Kanbayashi Mao

Hajime's younger cousin who lives in his neighbourhood. She calls the protagonist 'onii-chan'.

She used to live in Hajime’s neighbourhood when they were elementary students until her family moved away. Since then, they've been separated, until they were reunited when Hajime transferred to her school. Mao is almost positive this was an act of fate.

Naive and honest, she yearns for Hajime’s attention.
As she’s of the age for love, she sometimes finds herself swept up in fantasies of doing all sorts of things with him.

At first, she warns him not to breach the sacred ground of the rooftop, but when she realizes he’s serious about going up there, she gradually encourages him to do so.

Right before she moved when she was young, they swore they would get married.
Does Hajime still feel that way about her...?