Promise [English], by Mutsuki

Beware of childhood promises in Japan. They’re a trap. They’ll make you end up with a total cutie who remained in love with you for ten years and will still want to be yours only.
Here, this is with a female cousin, half-Russian half-Japanese (I picture her with fair hair), and, yeah, the story goes as far as fulfilling a childhood promise, it’s uncomplicated and yet “it works” ^^

The girl is almost the pettanko type, and the censorship is quite heavy, let that serve as fair warnings. Still, I liked the mood, the sensibility… it felt pleasant