Fiasse, a globally acclaimed singer, leads a unique Singing School while embarking on annual charity tours worldwide. Inheriting a legacy from her late mother, Fiasse becomes a target of nefarious individuals seeking her fortune. To safeguard her, Ellis, along with two skilled sword-wielding siblings, Kyoya and Miyuki, step in. As Fiasse prepares for her upcoming World Tour, the bond between childhood friends strengthens, united in their mission to protect her from unseen threats.