After I Transmigrated, I Became the Princesses' Personal Underwear

I transmigrated after being killed by a murderer. Unlike other transmigrators, I actually became a pair of underwear!

As my level rises, I'll unlock all sorts of strange skills...

What's more, the perverted king of this country, who's obsessed with his daughter, wants to send me to defeat the Demon King and save the princess! Help! I just want to quietly be a pair of underwear and get worn by someone... (Cover art by the author)