TV-Series
Description
Kazuto Tokino operates the family-owned Tokino Bathhouse against his parents' objections due to their concerns over its financial viability. His dedication stems from a desire to honor his late grandfather, who cherished the establishment, reflecting Kazuto's persistent, responsible, and hardworking nature. He exhibits kindness, sincerity, and protectiveness toward those close to him, though he can be stubborn.

A pivotal event occurs when Princess Valkyrie of Valhalla crash-lands her spaceship into the bathhouse, fatally wounding Kazuto. To save him, Valkyrie transfers half of her soul, reviving Kazuto but transforming her into an eight-year-old child with a correspondingly youthful mind. This act creates an intrinsic bond between them. Kazuto initially serves as caretaker for the childlike Valkyrie, guiding and protecting her. His feelings evolve into romantic affection for her true self, despite her physical form. Kissing synchronizes their souls, temporarily restoring Valkyrie to her adult form and enabling her to wield the Key of Time. Kazuto ultimately learns to love Valkyrie beyond her appearance, leading to their official engagement.

His childhood friend, Akina Nanamura, harbors unrequited romantic feelings for him. Kazuto remains unaware, attributing their closeness to friendship. He does not reciprocate due to his commitment to Valkyrie, though he deeply values Akina and expresses concern for her well-being. Kazuto’s younger sister, Rika, assists with the bathhouse but shares their parents' financial concerns; she supports his relationship with Valkyrie, partly for the perceived economic benefits.

Interactions shape his experiences: Sanada, Valkyrie’s catgirl maid, immediately accepts Kazuto as Valkyrie’s fiancé and aids them, though her overzealous protection sometimes causes chaos. Hydra, Valkyrie’s sister and rival, initially tries to forcibly return Valkyrie to Valhalla but later becomes entwined in their lives. Kazuto’s principled stance and dedication gradually earn the Valhallan Royal Family's respect, solidifying his status as Valkyrie’s fiancé.

His character develops through challenges. In later seasons, the emergence of Valkyrie Ghost—a manifestation of ancient princesses’ energies—tests their relationship. Events like Valkyrie’s temporal fracture into separate older and younger selves further complicate their dynamic, yet Kazuto’s resolve remains steadfast. His ability to unite humans and aliens through integrity and perseverance becomes a recurring theme.