The Frontier populance's hatred of the Vajra is growing by leaps and bounds, and even Alto and Luca cannot control their own hate. Meanwhile, Sheryl decides to sing again with a brand new perspective, and Luca discovers that Sheryl's singing can now generate faint fold waves like Ranka's because of her V-Type virus infection. However, this is only possible because Sheryl's infection has reached a terminal stage where it can no longer be cured. Alto learns of Sheryl's illness and promised Sheryl that he will stay by her side until the very last moment...