Makiyama Rui is a college student residing in the Kayama mansion alongside Licca Kayama and her family. His studies center on unraveling the enigmatic realm of Doll Land, a dimension tied to Licca’s concealed lineage as a princess. Introduced as affable and personable, he seamlessly assimilates into the household, fostering warm ties with the family while cautiously observing the supernatural events linked to their lives.

Licca harbors an earnest, youthful infatuation with him, though he remains unaware of her burgeoning feelings, assuming a gentle, mentor-like presence. Driven by scholarly intrigue, he probes the Kayamas’ hidden truths, methodically piecing together clues that intertwine Licca’s destiny with the Doll Kingdom. This relentless quest for knowledge anchors his role as a mediator bridging ordinary reality and Doll Land’s magic.

Within the manga’s narrative, his arc evolves considerably. Prolonged exposure to Licca’s supernatural struggles leads him to forge a bond with Doll Licca, a guardian warrior sworn to protect her. Their relationship deepens into romance, culminating in marriage after Doll Licca’s metamorphosis from doll to human—a symbolic union merging their two worlds.

His past remains sparingly detailed, with only his academic pursuits in Ozura clarified. He balances scholarly curiosity with a quietly protective demeanor toward Licca and her companions, though he steers clear of physical clashes. Preferring analysis to action, he contributes by deciphering enigmas and offering strategic guidance, solidifying his presence as a stabilizing anchor amid the story’s mystical conflicts.