touhou mother
A crossover fangame of the Touhou and Mother series made by S-Tel (E-HERO S-Chan) in RPG Maker 2000, first posted in video format on niconico before it was actually released in April 2009.
It's an ordinary day in Gensokyo, which is to say that everyone's bored. Hakurei Reimu and Kirisame Marisa head out to visit Kazami Yuuka, and while dealing with a fairy problem, they hear a loud crash. Nearby, they find a meteorite, an alien, and a certain boy who's wandered into their world...
Kirai Shouen is credited to have redrawn every sprites in this game.