MTL - Warhammer: The Beginning is the Crisis of Annihilation - Chapter 280 Assassinate the Emperor (Subscription required)

“Your Highness, there’s something I’d really like for my birthday.”

“What is it?”

“Will you promise to listen?”

Then the man blatantly laughed.

But who would point out his arrogance – a young Northern Duke who’s not even afraid of the Emperor? He could even get a throne if he wished for it.

But it was just a sweet lover’s birthday wish.

“Alright. I swear.”

So, Juliet spoke lightly,

“Please break up with me. I don’t love you anymore.”

A fiance just for show. A succession of meaningless nights.

Now is the time to end seven years of unrequited love.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

In the end, war couldn’t be extinguished. But, there was a transformation. Even in the heart of a worthless accomplice in murder who was indifferently continuing his task, there was a transformation. The massive weapon “Object”.

This was a weapon that changed the whole definition of war. An exchange student named Quenser, who was dispatched to the battlefield, met at the base a girl with a strange aura. The girl, dubbed “Elite”, is the pilot of “Object”. The near future. This diminutive boy had come to take on the role of standing up against the strongest weapon “Object” for the sake of the girl. This was the motive for their first meeting.

Entering Tokyo in the bubble era, in this strange era, the only familiar ones are Matsuda Seiko, Nakamori Akina, Kudo Shizuka…

- Description from novelbuddy