Robin-kun to 100 nin no Otomodachi
English name: Robin with his 100 Friends
Genres: Comedy
Type: ONA, Episodes: 13
Aired: Oct 11, 2010 to Jan 3, 2011
Source: Unknown
Rating: G - All Ages
Synopsis:
Robin, a boy who likes to invent something alone, decides to make a lot of friends when he has to move from downtown to "Green Village". At the stage of "Green Village" which is set the newest environment system for nature, each episode has a lot of questions about " true ecology" and "true friends" through the activities of Robin and his 100 friends.

(Source: Official Website)