N/A, it has 44 views
Mezameru to Itoko wo Mamoru Bishoujo Kenshi ni Natteita目覚めると従姉妹を護る美少女剣士になっていた
Ero Light Novel...
This is the first of a three-novel series with two spin-off novels.
The title describes the basic premise well enough: It’s about a boy who suddenly discovers he transforms into a girl whenever his female cousin in danger.