Tabeta no Daare
English name: Who Ate It?
Type: OVA, Episodes: 4
Aired: Jul 5, 2000
Source: Picture book
Rating: G - All Ages
Synopsis:
Episode 1 - Popopopopo
Episode 2 - Tabetano Daare
Episode 3 - Saru Rururu one more
Episode 4 - Hayaku Aitai na

(Source: Official Site)