Sophia Demiurge - Chapter 77: The Meeting.

In the era of interstellar warfare, every melee mech will be paired with a long-range sniper mech to cover the battle.
The sniper mecha master Yan Xueshan (beta) and the melee mecha master Arthur (alpha) are just such a pair. The two have been together for six years.
The upcoming Armageddon is a near-death battle.
the day before.
Yan Xueshan: “Remember to write a suicide note in advance.”
Arthur said frustratedly: “I have only one regret. If I die this time, I will be a virgin until I die.”
Yan Xueshan snorted coldly: “…no promise.”
Arthur asked pitifully, “Master, can you fulfill my dying wish??”
Yan Xueshan: “?”
How absurd.
But Yan Xueshan thought about it, this is his comrade-in-arms, whose life and death intersect, chastity counts as a p- OK, I agreed! !
However, after the Armageddon, none of them died.
Not only did they become war heroes, Arthur also turned into a federal prince.
Arthur took out the marriage application, just one signature, and said honestly and faithfully: “Master, didn’t you say that you will go back to get married and retire after this battle? You help me fulfill my wish, and I will help you fulfill my wish too!”
Yan Xueshan: … something seems to be wrong?

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- Description from novelbuddy

Follow Kairi Izumi—a quiet, eccentric, and somewhat conspicuous girl— who never felt like anything but an NPC in a story. Working behind the scenes, unnoticed by others had always been part of her daily life, dwelling with medicine and toxins.So, it's not surprising that she wasn't tad attractive according to others.That is, until one day... that guy, he confessed to me.Wait a minute—doesn't that mean I'm a heroine now? Hang on, how is that even possible? Me? Heroine? No way! I’m just a girl from a small village who likes to help others. I don’t particularly stand out, and compared to the other girls, I’m not even that attractive.And so, a question lingers, driving the unfolding of this dumbfounding narrative forward:Wait, what do you mean I got reincarnated to be a heroine?That's weird because usually a heroine is not strong let alone smart - they are usually dumb, cute and pretty. Definitely not me. I mean, how is that possible? Me? Heroine? No way!

Ichiro was a man who had to live through a tragic and awful life.After losing his wife, his only source of happiness, his despair only got worse until the day he died.To Ichiro's fortune, the Goddess of Life, Phelena, decided to send his soul into a new body in another world. His only condition was for the Goddess to send him far away from people.The goddess agreed, but she certainly had other plans for Ichiro's new life.A wholesome story about a man rekindling his love for living and encountering his lost wife in another world![Story is written in 1st person with a casual tone]

He crossed over to a new world where humans have magical power. They are called warriors. They use their power to kill the monsters that appear out of nowhere. Dragons, Dungeons, and Magic users are pretty common in this world. If you want to live in peace, you need to have that power. You can also become a powerful clearing dungeon.

In this dangerous world, he has a system that can help him grow stronger. But he didn't want to be a high-profile warrior who attracts much powerhouse attention or become a lab rat. He wants to be Low-profile and grow strong using his system.