I've Never Seen a Saint who can use Magic so Well - Chapter 108

Eren Idril died as an old, decrepit, and piss-poor adventurer by the maws of a D-Rank monster. He had a lot of unfulfilled dreams and desires that couldn't see the light of the day after the light in his own eyes died down.

But fortunately for him and unfortunately for the world, that wasn't his end. Eren was somehow dived back in time when he was a mere teen, attending Lionheart Academy for adventurers.

When life gives him a second chance, Eren decides to exploit it to its fullest. Experience his vile deeds as he partakes in them without feeling the slightest bit of hesitation.

Let someone else go to war, you, lucky Austria, go get married! What the god of war can give you, the god of love can also give you.

The smoke of the Napoleonic Wars has dissipated, and the Vienna system that once brought peace to Europe is riddled with holes. Beneath the seemingly peaceful appearance, there is a vortex of the times with undercurrents, the tranquility before the storm.

The air is filled with the steaming mist of sweat, and the choking black smoke makes it hard to breathe. On the elegant dining table, a group of soldiers and fat men in suits are pushing each other, feasting on the feast called the world, hanging on the wall Van Gogh’s self-portrait with waltz in his ears.

Suddenly the music turned into a march, and the picture also turned to the battlefield. Soldiers marched in a neat line, walking towards the machine gun barbed wire.

A shell fell on the ground, and after the smoke passed, countless cavalry rushed to the artillery position.

Accompanied by a loud noise, a wooden plane flew close to the ground, then pulled up rapidly, broke through the clouds, and shone brightly.

- Description from novelbuddy

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.