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A Japanese streamer’s passion project has quickly turned into a major indie success. Mamon King, a monster-raising simulator inspired by Monster Rancher, has sold 60,000 copies in under ten days. The game marks a debut collaboration between indie studio LiTMUS and Japanese streamer-turned-developer Yoshinama.
A Risky Investment Driven by Passion
Initially, Yoshinama invested 25 million JPY, or roughly $160,000 USD, from his personal savings. At the time, he admitted he did not care if the game sold well. Instead, his goal focused on creating his dream project. Despite limited experience in game development, Yoshinama’s determination stood out. His eagerness to learn ultimately convinced LiTMUS to move forward with the collaboration.
Sales Far Exceed Expectations
According to LiTMUS, Mamon King exceeded its sales target by six times. Originally, the team aimed to sell 30,000 copies within a year. Instead, the game doubled that figure in just over a week.
As a result, the title briefly topped the Japan Steam Top Sellers chart. It also became the second most-downloaded title on the Japan My Nintendo Store. Although its rankings have since dropped, the achievement remains significant.
LiTMUS Reflects on an Unexpected Success
LiTMUS game director Yu Totsuka revealed that the project began as a low-priority title. The game’s genre and scale made it a risky venture. However, Yoshinama’s commitment ultimately changed his perspective.
Speaking in an interview, Totsuka expressed shock at the response. He also thanked the community built around Yoshinama. In addition, he confirmed that the team is already preparing a future update.
Yoshinama Thanks the Community
Yoshinama also shared his gratitude with players. He credited fellow streamers and word-of-mouth for driving attention to the game. More importantly, he confirmed that all earnings will fund his next project. According to Yoshinama, his goal is now to create an even better game using the lessons learned.
What’s Next for Mamon King
Looking ahead, Mamon King will receive content updates that expand the base experience. Furthermore, a physical Nintendo Switch edition is currently in development. Ultimately, the game stands as a strong indie success story.
It proves that passion, community support, and creative risk still matter. Mamon King is available now on Windows via Steam and Nintendo Switch. For more details on the game, visit their official steam page.
