My Sister is a Duck

"Introduction: Ishu traveled through time and

came to a world that seems very dangerous.

This world has Honkai beasts, death soldiers, mechas and Valkyries.

And... Herrscher.

But it doesn't matter, he has a system.

"Mystic Eyes of Death, open! Flash Sheath—Nanaye!"

A pufferfish: "Ameruo!" "

Destiny: "Why is this man so fierce?"

A white-haired and childlike man: "Ishu, are you a captain or a Valkyrie? !"

A twin: "Brother Ishu is so powerful, I don't seem to be worthy of him... What nonsense are you talking about? ! Go and grab him for me!"

A banya: "Did you see that handsome guy? That's my brother! No one of you is allowed to grab him! Heavy-armored Bunny 19c!"