As Shirogane's powers get sealed away into a scroll, he invokes Secret Art Gender Swap Awakened onto Matsuri, turning him into a girl with no apparent way to transform "her" back into "her" original gender.
Example of:
Forced Transformation
As Shirogane's powers get sealed away into a scroll, he invokes Secret Art Gender Swap Awakened onto Matsuri, turning him into a girl with no apparent way to transform "her" back into "her" original gender.
