At the end of the second semester of third year of high school, four students are prepared for graduation and feel the ending to their high school life. But that changes a little with the arrival of a transfer student.
Tokonome Mamori is transferred to Mermaid - an artificial quarantine island for people with superpowers. When Mamori is attacked, a newly transferred girl named Mirei saves her. The enemy doesn't stop, however, and the two are soon cornered. Just when they think all hope is lost, Mirei kisses Mamori, and Mamori turns into a sword. Mirei then wields the sword and launches a counterattack against their enemies.
Yuna Yoshino (芳野 由奈, Yoshino Yuna, July 5th) is a Japanese voice actress from Kanagawa prefecture. She has been a member of ULTRAEGGs since April 1, 2021. Previously, she was attached to Clare Voice until December 31, 2017.