Infinite Growth and Evolution

There's a strange VR game where you evolve your monster. It's a game about becoming a monster, not hunting monsters or using them.

This strange, popular game has just launched online. Keigo Yoshizaki, already obsessed with the offline version, buys the online version without hesitation and starts playing. All right, you're the one.

His randomly determined species is "moss," and how is he supposed to capture it...