Original Title: ないしょのティンティンたいむ
Romaji: Naisho no Tintin Time
Released Date: 2005-08-26
Company, Producer: Blue Gale
Getchu link: http://www.getchu.com/soft.phtml?id=152901
VNDB: https://vndb.org/v1735
It has been uploaded a few times on anime-sharing, but all the links are dead. Can't find it...