Chi's Sweet Home is a manga and anime series about a lost kitten who gets adopted by a loving family. Interchannel-Holon is turning it into a heartbreakingly cute DS game that combines comic-style storytelling and graphical text adventuring with adorable and weird minigames. Depending on the date, different minigames will be available, ranging from throwing a ball for Chi to ... kitten sumo? It also includes the requisite interactivity, allowing you to pet, feed, and otherwise care for little Chi.
It's easy not to love the soulless, polygonal Nintendogs, but Chi's face could easily sway even the most stalwart pet-game hater. This isn't a standard pet game, in any case -- it's an adventure game starring a pet.