Dungeon Overlord: Monster Girl Harem! - Chapter 142: Echoes in the Heart

A young man dies and is transported all the way back into Ancient Sparta. Underneath all the bravado is a now failing nation after over extension from the Peloponnesian war against Athens. Will the man save Sparta and forge it in his desired image? Or will Persia, Athens, and other city-states or empires crush them!Contains portrayals of real life leading figures and gets to the nitty gritty of the often disgusting and disturbing life's people suffered through in Ancient Greece.Expect a new chapter a few times a week. Total world count 30,000

In the era of universal mechas, people can go to the endless abyss, collect materials, strengthen and forge their own mechas, and master the power of destroying the world.

Jiang Chen traveled through time and awakened his talent [Immortal Unarmed]. Once the mecha is broken, he can permanently absorb its power and receive multiple bonuses.

…

At the bottom of the abyss, when the Old Demon God finally broke the Titan mecha with great effort, a hand stretched out from the fragments and held down its head.

“Congratulations, you have unlocked my limiter.”

- Description from novelbuddy

Daiki Tsukasa transmigrates to a world of everyday anime crossovers.At the start, he purchases a Special-Grade Cursed Object, activating the Great Collector System.As long as he collects valuable items, he can receive rewards.『 Congratulations, host, for collecting the Special-Grade Cursed Object — Sukuna's Finger. Reward: Innate Domain — Malevolent Shrine! 』『 Congratulations, host, for collecting the Yukinoshita Family. Triggered Triple Bond. Reward: Immortal Dual Cultivation Technique! 』...Miku Nakano: I was here first! Get lost, you vixen!Yukino Yukinoshita: Could you stay away from my sister?!Iroha Isshiki: Senpai! You won't abandon your cute kōhai, right?۞۞۞T/N: Be advised that characters and powers will be used, but not necessarily in the exact order, logic, manner, or arrangement that occurs in the original. Some stories will obviously be changed to fit into this mixed world with so many characters.

Time travelling from the majestic era after the Recuperation of Reiki, he became Kimura Kazuki, a 16-year-old high school student in Japan, one year before the Reiki Recuperation.

Tentatively, he set out to hone himself to the bone, burning candles at both ends to stockpile resources in preparation for the imminent Recuperation of Reiki. His goal was to be many steps ahead of all humanity when the time comes.

However, it seemed like fate had decided to play a cruel trick on him.

One year later, the Recuperation of Reiki… did not happen as expected.

- Description from Novelupdates