Apocalypse: I Can See the HP Bar, Killing Monsters Drops Loot - Chapter 8 - : Double Kill_1

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

Upon awakening in a parallel world, Lin Yi discovered that not only were Xiao Zhuang and Xiao Ying present, but also veterans like Old Pao, Tou Lao Gao, Qiangzi…He had unlocked an Entry Upgrade System.【Shooting Novice (White) → Hundred Paces Piercing Yang (Gold)】【Superior Memory (Blue) → Photographic Recall (Gold)】【Master of Struggles (Blue) → Supreme Titan of Competition (Gold)】【Martial Arts Grandmaster (Purple) → Mortal Warlord (Red)】【……】As time passed, Lin Yi steadily advanced towards the peak, growing ever stronger.Yet, as he ascended, unexpected figures began to emerge before him—He Chenguang, Xu Sanduo, Lei Zhan, Yan Poyue, An Ran, Long Xiaoyun, Shen Ge…Only then did Lin Yi realise that this was not merely the world of Special One, but a vast amalgamation of multiple special forces universes.

“Su Jingzhen, you’re not young anymore, and your sister-in-law has come to ask you. Do you want a Dao Companion or not?”“Sister-in-law, who is it?”“I…”As a male cultivator, Su Jingzhen had always thought that he would live a peaceful life in the immortal world, but unexpectedly, he became the hardest whetstone to sharpen others.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- Description from Novelupdates