Arisugawa Haru, alias Pink Gelato, operates as a member of the hero squadron Gelato 5. She joined the team roughly six months before the main events, utilizing the call sign "Pink Gelato" and a battle catchphrase invoking peach aroma and love's flavor. Her appearance includes black hair, and she displays bright, energetic, and active qualities in combat despite her newcomer status.

During middle school, hoodlums attacked Haru until Desumi Magahara rescued her, advising her to grow stronger. This encounter fueled her decision to join Gelato 5, partly driven by admiration for the squad's leader, Fudo Aikawa. She developed a crush on Fudo, creating potential romantic tension with Desumi.

Haru later discovers photographic evidence of Fudo with an unidentified girl—revealed as Desumi in civilian attire. She attempts to confront Fudo but is interrupted by ongoing battles between Gelato 5 and their foes. Subsequently, she directly observes Fudo and Desumi together, confirming their secret romance. Rather than reporting this to Gelato 5 leadership, Haru privately challenges Desumi to a fight. During this confrontation, Haru reveals Desumi’s past rescue and acknowledges that witnessing Fudo and Desumi’s mutual happiness deterred her from interfering. This emotional resolution culminates in Haru crying and falling asleep in Desumi’s lap, symbolizing acceptance.

After this pivotal moment, Haru maintains cordial interactions with both Fudo and Desumi. She sets aside her personal feelings for Fudo out of respect for their relationship, shifting focus to supporting her Gelato 5 teammates. Her combat role continues emphasizing energetic engagement against antagonistic forces, particularly the organization Gekko.