To Heart: Remember My Memories
Genres: Drama, Romance, Sci-Fi, Slice of Life
Type: TV, Episodes: 13
Aired: Oct 2, 2004 to Dec 25, 2004
Studio: OLM, AIC ASTA
Source: Visual novel
Rating: PG-13 - Teens 13 or older
Synopsis:
Time flies by; Hiroyuki and Akari are 12th-graders now. Both of them and their friends have grown up gradually in someway, physically or mentally, but one of their best friends is missing: the lifelike android Multi. To their surprise, Multi is brought to their campus again without notice, yet she is no longer the same Multi they have known. 

(Source: ANN)