How come the celestial technique I stole is so powerful?! - Chapter 432: An Alternative Explanation of the Life Gate

[First monster slain. Special rune obtained. Level 2 has been reached.]

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

Cheng Xu, whose entire property is a waste recycling station, accidentally awakened the system, but why does this system only have a [decomposition] function? So let’s start by refining the gold in circuit boards.

“Wait, I seem to be able to use it to probe?”

“It seems to be good for repairs?”

…

Since then, Cheng Xu has become a humanoid X-ray machine, a humanoid 3D printer, a maintenance master…

But when Cheng Xu completed the first system task, he found out that he really unlocked the system now?

This book is also known as “One Thousand Ways to Use the System” and “My Roommate Who Collects Waste at Home Becomes My Mentor after a Summer Vacation?” “, “You want to marry a waste collector? 》

- Description from novelbuddy

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction.

As the Shield Hero, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!