The game - Onegai Monsters - Nintendo 64 | N64

A toy like an RPG/quest. Like, because it's hard to say anything specific. The toy is cute, but all in hieroglyphs. You choose a character - boy or girl - and start playing. The monsters referred to in the title play an important role (apparently :)), at first the hero has at his disposal one of them in the form of a drop. The rest is known in the game.