Just a Guardian

You owe a little girl five hundred million for saving your life. How are you going to pay it back?

With university graduation just around the corner, the protagonist Mu Sijiu transmigrates after an accident and becomes a guardian who can travel between many different worlds.

A vampire's lover, the wielder of a holy sword, a dragon girl's knight...

In every world, he witnesses the will of a different girl.

(True harem)