Tezuka Osamu ga Kieta?! 20 Seiki Saigo no Kaijiken
Genres: Mystery
Type: Special, Episodes: 1
Aired: Dec 5, 2000
Source: Unknown
Rating: PG - Children
Synopsis:
New Year's Eve 2000. An eternally juvenile Tezuka Osamu meets his creations for a New Year's Eve party at the Dr. Tenma's mansion, but before the event begins he suddenly disappears from his room in what looks like a kidnapping. A classic mystery setting for, at the end, a lovely homage to the man behind the genius.

(Source: AniDB)