I'm The King of Business & Technology in the Modern World - Chapter 208: Honeymoon Part 2

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

A tale about the former leader of a special organization that served under royalty, now leaving his past life behind and unintentionally getting involved with the martial world.

Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school. Haruka’s beauty and charm made her the center of attention, quickly becoming the school’s prima donna. But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically. Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death. However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life. Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible. This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies. From their mothers, sisters, and lovers to their closest friends, Haruto will make them his. His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.

Travel through Hokage to become Terumi Mei’s cousin, and become the second in command of Kirigakure Village! Simulate life with a god-level simulator! Get rewarded for doing evil in the simulator!

【Ding! Life simulation on]

[You were born in a commoner family of Konoha, but you have extremely strong Chakra reserves at birth]

【Seven years old, you started school and helped transfer student Kushina Uzumaki】

[Half a year later, Uzumaki Kushina confessed to you, and you accepted it calmly, but in the end suffered the grudge of Namikaze Minato]

[Three wars broke out! You were sent to the battlefield, but you were repeatedly stumbled by Namikaze Minato, you found the right opportunity to kill him]

[The war ended in your hands, and soon you married Uzumaki Kushina and gave birth to eight children]

[A happy and happy life is over, this simulation is rewarded: fairy body]

After the simulation is over, you ask Yakura to announce to Konoha as Mizukage: “You are going to propose marriage to Konoha Kushina!”

- Description from novelbuddy