Yasashii Akuma
English title: The Kind Devil
Japanese title: やさしいあくま
Type: ONA
Episodes: 1
Source: Picture book
Studios: Kate Arrow
Duration: 25 min
Rating: G - All Ages

An Amazon Prime Japan Video exclusive.

Foo, a kind boy, lives together with his grandmother. However, Foo has no friends. One day, as Foo is off picking herbs on a mountain to treat his grandmother's illness, he finds himself lost. But then he is saved by a boy demon with bright-red skin named Smoochy. The two kind yet friendless boys meet and become each other's first friend. The two begin to spend their days playing together, until one day Foo suddenly stops coming to the mountain.

(Source: Official YouTube channel)