Shiren the Wanderer 2: Shiren’s Castle and the Oni Invasion

A Mystery Dungeon game where you have to collect resources to build a castle, with a very charming story. After the credits roll, there's a second game where you capture, collect and battle monsters.

https://n-europe.com/features/all-n64-games-377-shiren-the-wanderer-2-shirens-castle-and-the-oni-invasion/