Becoming evil makes you ten times stronger, but becoming a demon gives you hundredfold strength - Chapter 40 - 35 Roar of Mirror 12

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

When I transmigrated, the protagonist was already dead.Now, I have to protect the world after the bad ending.So first things first, I became the enemy of the main heroine, who was on the brink of ending her life.“I finally understand what all those things you said really meant.”“I’m like this because of you, junior. Take responsibility.”“I can only sleep when I’m next to you.”…But for some reason, everyone is starting to act a little strange.

Killed in the apocalyptic world and reborn as his 18 year old self, Luke Greyson was given a second chance at life. A second chance to change everything and save his loved ones. With the knowledge of upcoming apocalypse, he will fight and kill to survive and to save his loved ones. From mediocrity, he will rise to become the strongest war god and feared by gods and devils alike.

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“Obtaining the topmost degree of talent in sword arts in the world requires giving up 72 years of lifespan, which leaves you with only five more years of your life. At the same time, you will never be able to feel love, kinship, and friendship, and you’ll end up leading a lonely life until your death, unable to procreate, or to have any descendants.

“From now onwards, everything related to happiness in the human world shall no longer be of your concern. Are you willing to accept this?”

“Hahahaha, I’m already alone bereft of all support, my hopes dashed to pieces, shouldering only absolutely irreconcilable grudge and hatred, why would I disagree? Why would I not want it? I couldn’t ask for anything better!!”

His sword sweeps across the Divine Continent for seven days and nights, moving 90,000 miles through the starry skies, unhindered.

He slays saints and buddhas in Heaven, slaughters demons and devils in Hell, sweeping away all the grievances in his heart.