Ryuu no Kawaii Nanatsu no Ko

Ryuu no Kawaii Nanatsu no Ko (九井諒子作品集 竜のかわいい七つの子) is a manga series by Ryoko Kui. It was serialized in Fellows!.

Plot
A series of seven stories revolving around lives where fantasy intertwines with our known worlds. In historical and modern landscapes, there are unique circumstances brought about by dragons, mermaids, spirits, and so on.