In JJK With Naruto Powers - Chapter 41: Yaga’s Fluctuating Mood

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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One moment, he was playing Haikyuu: The Mobile Game; the next, Taichi found himself transported into the world of Haikyuu.Transmigrated as a member of Aoba Johsai, Taichi was presented with the opportunity to face the fabled main cast of Haikyuu.[The Genius Omni-System is activating...Please wait...]“Hinata Shoyo? Kageyama Tobio? Ushijima Wakatoshi? Bring it on! Let the Monster Generation line up—I’ll take on ten of you!”Follow Kaedehara Taichi's journey from a no-name in Volleyball to the 'Absolute Monster' of the Monster Generation.“Gear up Oikawa-san, for we are about to win it all!”

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Wandering for fifteen years, Jiang Sheng picked up five elder brothers for herself.

For their sake, little Jiang Sheng went through fire and water, desperately making money.

The elder brothers didn’t disappoint her, giving everything for their little sister.

Until the General’s mansion discovered the switch of the legitimate daughter, and hastily brought her back.

But they didn’t treat her well either.

Some ridiculed her vulgarity, some laughed at her ignorance, some scorned her coarseness.

Yet no one knew, the new top scholar was her brother, the newly rich royal merchant was her brother, the returning victorious little general was her brother, the saintly healer was her brother, and that one… was also her brother.

However capable the fake young miss is, does she have five elder brothers to support her?

Note: The main characters have no romantic relationships, the female lead has a childish personality and focuses on familial love!!!