Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 2 - 2-2. Let's Learn Life Magic!

The world had started doomsday, and I struggled for a year, before I died under an enchanted beast’s claw. Heaven has given me another chance, back a day before the end happen. Will I be able to change my fate, and that of my loved ones? Now, I will start my journey on becoming the strongest on the planet that the Gods have changed into a game world.

- Description from Novelupdates

[This is an everlasting love story.]

The second son of the Count family, Tullius Shernan Oubeniel, was a person who reincarnated from modern day Japan. That is, a person who has a single experience of death. With no understanding as to how he was reincarnated, he thought that perhaps, he might be reincarnated next time in the same way. Yet, his fear of death was greater than anything – above that, he could only do things such that he avoids death. Peculiar to this world were certain kinds of magic and one of them was alchemy. Choosing this class of magic, he was said to be able to attain perpetual youth and longevity. With that as his only salvation and goal, he had to reach out his hand towards the deepest secrets of alchemy and did so as though it was the only way for him to live. Even if there were sacrifices to be made for that end.

A s*ave maid admired him from his youth. A Count family. Adventurer. s*ave. Citizen. Aristocrat. Country. Humans. Other beings that were not human…… Just because of one man’s delusional obsessions, many lives were changed, warped, torn apart. Even then, Tullius’s footsteps never knew pause. Everything was so that he could reach the forever he longed for.

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The aliens came with hostility.
Facing the invasion of aliens, human beings are weak like ants.
So this is the end, the real end.
But there is resistance when there is an invasion.
For some, this is not the end, it is war.
So this is war.
Real war!

- Description from Qidian

Yuki, a high school junior, dies heroically saving a stranger and is reincarnated in a fantasy world, where he discovers an extraordinary and unrivaled power.