モンスターメイトSP is an RPG game created by OpenDoor for Android devices. The game has been ranked as the #1 game on the Weekly Game Ranking of AppGet. The game is about collecting monsters and traveling with them. You can raise your monster friends and make them even stronger by absorbing other monsters. The game even features unknown monsters that you can transform into! The goal of the game is to complete all the monsters.

The game has an interesting story about a world that is in danger from a negative emotion called "Nol" that suddenly appeared from the demon world. People are defenseless against it, and they are afraid. However, a boy from a clan of "monster users" becomes the friend of the "Six Great Lords," who are the key players in the fight against Nol. The boy and his monster friends help the Six Great Lords win the war. After the war, the boy and his monsters disappear, and the Six Great Lords manipulate the information to make it look like they won the war. Five hundred years later, the fear of monsters remains, and the clan of monster users has disappeared from history.