Ren Homura struggles with amnesia about his life before returning to his hometown. Glimpses of his forgotten past resurface unpredictably, coinciding with and enhancing his remarkable skill in Monster Strike. His key monsters are Oragon, Fenrir X the Monsterwolf, and Ryoma the Visionary, who evolves into Hero of the Restoration, Ryoma.

During a summer break Okinawa trip depicted in "Mermaid Rhapsody," a mysterious girl on the beach implores Ren for help before vanishing. This encounter drives his quest to discover her identity and the reason for her plea, committing him to her rescue and fueling the story's central action.

Ren consistently teams with allies Aoi, Akira, and Minami to face challenges. Their dynamic shifts when Mana, an American transfer student, joins the group. Together, they combat threats from monsters crossing over from the game into reality. His bond with Mana deepens into romance.

The meaning of his name, "Homura" ("flame" or "blaze"), reflects facets of his character. Ren navigates the voids in his lost memories while confronting ongoing conflicts involving monsters in both digital arenas and the physical world.