Sora Otosumi (音澄 宙, Otosumi Sora) is the main protagonist of Kamen Rider My-Th. He is Yuna Mizuki's servant and the meister of House Mizuki who transforms into Kamen Rider My-Th (仮面ライダーマイス, Kamen Raidā Maisu).Background

Sora Otosumi was born the son of his father Yamato Otosumi as a member of the Otosumi Family, which has served in roles similar to the

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for the prestigious House Mizuki for generations.When Sora was in middle-school, he was in a car ride with his father, who was driving Yuna and her parents. However they were involved in an overpass accident caused by a Tsubasa Fukashigi which led to the deaths of his father and Yuna's parents. Sora picked up the My-Th Driver in the possession of House Mizuki and transformed into My-Th to defeat the Fukashigi. Since then, Sora vowed to protect Yuna no matter what.[2] They also met Akira Amataka at the the time of the incident, who would become the two's benefactor.

For the next eight years, Sora continued to further himself by accumulating skills needed to be the best servant he possibly could.Encountering the Zyunishi Doumei

After investigating a Fukashigi, Sora meets Tatsuomi Asao and transforms into My-Th in front of him, not knowing who Tatsuomi's true allegiance was. Shortly after Tatsuomi became Yuna's tutor and club advisor for Yuna's Fukashigi Research Club, Sora continued hunting for Seed Eggs to replenish her health. On his hunt, he encounters members of the Zyunishi Doumei, all who are after the Seed Eggs for unknown purposes.