Manabu no Natsuyasumi
Genres: Fantasy
Type: OVA, Episodes: 1
Aired: 2005
Source: Unknown
Rating: G - All Ages
Synopsis:
Released by JCI (Junior Chamber International) Japan to promote self awareness and appreciation of "Japan's soul".

Manubu's mother leaves him with his uncle, grandmother and niece Kiyomi to spend his summer vacation.
Him being a real city brat he has no real appreciation for nature and the outdoors and the values of life. He will soon learn differently...

(Source: AniDB)