Yumoto Hakone attends Binan High School as a first-year student and serves as a core member of the Earth Defense Club. He lives at the family-run Kurotamayu bathhouse with his older brother Gora, who acts as his guardian due to their parents' frequent work absences. Yumoto sports thick blonde hair, reddish-brown eyes, and the standard Binan High first-year uniform, notable for its light blue sailor scarf. His personality is innocent, cheerful, and somewhat gullible. He often lacks common sense but remains unfazed by unusual events, like meeting a talking wombat. Yumoto harbors a strong fondness for cute, cuddly things, frequently attempting to hug the extraterrestrial wombat, Wombat, despite its objections. He declares his catchphrase, "Love is over!", after purifying monsters, typically met with other characters retorting, "No, it’s not!". Yumoto occasionally feels self-conscious about being seen as an airhead. He shares a strong bond with his brother Gora and deeply respects third-year student En Yufuin, addressing him as "-senpai". En reciprocates this care, notably comforting Yumoto during Gora’s kidnapping. Yumoto also maintains friendly relationships with his fellow Earth Defense Club members, though they initially found his behavior peculiar. As the superhero Battle Lover Scarlet, Yumoto wields the power of light and represents the color red. His transformation involves kissing a "Lovracelet" and proclaiming "Love Making!", followed by a multistage outfit summoning that varies between seasons. His primary weapon is the Love Stick "Lumiere of Love", enabling attacks such as "Scarlet Lumiere" and "Love Sprinkle". In battle, he collaborates with the other Battle Lovers to combat monsters created by the antagonistic Conquest Club, emphasizing themes of love and friendship. His story arc includes reconciling with the Conquest Club and participating in graduation-focused OVAs, where he bids farewell to Wombat while expressing gratitude for their time together. His post-graduation plan involves inheriting the family bathhouse. Yumoto does not appear in later installments like *Happy Kiss!* or *Haikara!*, which feature new protagonists.