Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita (Visual Novel)

One day Ryou wakes up as a girl, which comes as a shock for him.

Apparently his family's main branch has long protected the secrets of oni mastering. Some of oni are displeased with this slavery and continuously target a member of the family with the highest Renki power, called the Oni-Pleasing Princess. The current Princess is Yume, Ryou's cousin and his secret crush.

Oni-Pleasing Princess receives a protector swordswoman, called the Oni-Cutting Princess. The protectors have always been female, and as Yume unconsciously wanted Ryou to protect her, he has awakened as Oni-Cutting Princess, at the same time transforming into a girl.

Now, oni are gathering to make an attack on Yume, and Ryou must use his newfound powers to hold them back.

When I Woke Up, I'd Become a Pretty Swordswoman Who Protects My Cousin

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