Antique Heart
Genres: Mystery
Type: OVA, Episodes: 1
Aired: Jun 5, 1988
Studio: J.C.Staff
Source: Original
Rating: G - All Ages
Synopsis:
There's an old decrepit building at the edge of the school grounds that hasn't been used for years, and it falls apart a little bit more each day. But the little house holds a secret, as Takahiro and his friends are soon to find out...they wind up making contact with a mysterious entity known as Saki. Can Takahiro save Saki's world from destruction.

(Source: ANN)