Psychological

God created the Abyss to escape his boredom. Trapped in the hellish Abyss, humanity was on the path to the apocalypse… “Is it over for us… now…” On the brink of humanity’s annihilation, the four strongest survivors tried to prevent it by traveling back in time to the point just before humanity was pulled into the Abyss. But only one of them could go back to the past. “What’s there to think about? Isn’t it already decided who’s going? The strongest among us, Kang Hansoo.” This is the story of the life of the legendary powerhouse, Kang Hansoo, who returned to save humanity from its doom.

While running for his life in the woods, bullying victim Gyuhwan stumbles upon a shotgun and just enough shells for his classmates. It’s a recipe for disaster. But fate takes an unexpected turn when he returns to find his classmates under attack by brain-eating creatures. Now, the only thing that stands in the way of their ravenous feast is a boy with a shotgun.
Chico Escopeta
Le Garçon au fusil
Мальчик с ружьем
猎枪少年
猟銃少年
獵槍少年
獵銃少年
엽총 소년
엽총소년

Labeled "Experiment A" by five of his classmates and tortured throughout sixth grade, Shun Uruma hung on by a thread. When his bullies targeted his family, leaving him with nobody but his grandfather, it was the final straw—Uruma had suffered enough. Determined to get back at his enemies, Uruma begged his grandfather, a WWII veteran, to guide him through the path of vengeance.

Four years later, Uruma completes his intense training and embarks on a brutal journey of torture and retribution to hunt down the five monsters who made his school life a living hell.

A man who had lost everything.

An almighty power, the [Zero Code] held within his hand.

“Player Kim Su Hyun, do you truly wish to revert the time of Hall Plain?”

“I want to go back 10 years. To that period when I first came here.”

After losing his wife and daughter in a horrific accident, Yun-Jae finds himself stuck in his routine until he receives a diary from his future self. “I can see… my wife and daughter again?” Through winning the “games” in the “parallel world,” one will receive a “prize,” and using this, he could revive his dead family… but out of all the survivors of this cruel world, Yun-Jae is the only one with the knowledge of the future. Will he be able to turn his greatest wish into reality?

The Black June summary:
7 deadly sins... 7 murders. The tested and the testers... "I will always be watching you"

It's a crime suspense manga about a kid who can kill people in their dreams...or can he?

Teiichi no Kuni summary:

The manga centers around Teruasa Oda, a high school senior gifted in smarts, looks, and money. This seemingly perfect scion of Japan's powerful Oda Group gets caught in a nightmarish game with the son of the Belmont mafia family's boss.

After 12 long years, a white-haired boy by the name of Iori comes back to Mashira village, the place where his childhood trauma began, only to find yet another horror awaiting him.