Dragon Raja: A Guide to Raising a Water Dragon King

(Making up for past regrets, the protagonist is the Ocean and Water King, Su Enxi is his older sister, delving into the original work's more peripheral or even unmentioned details. Multiple heroines, no mindless wish fulfillment.)

Su Zhaoran is suddenly told that he has only three months of memories left.

His older sister Su Enxi, who has been by his side since childhood, disappeared years ago and left only the message, “Don't look for me.” Then, one night, Sakurazuka Mai blocks his door and says, “Your sister asked me to take care of you.”

On a stormy night, Xia Mi crawls into his bed clutching a pillow. “Let's team up!” Gen Chisei, his online friend, sends him sunscreen and calls him a business partner. Lu Mingfei crouches beside a grayhound bus, shouting, “Big bro, help!” A little monster holds up a sign, begging to go out for fun, and even wants to bring along Su Enxi.

But when Su Zhaoran uncovers the truth, he learns that...

It was all part of a path someone had laid out for him to awaken as a Dragon King!