Ultraman - Only Want To Protect You - Chapter 18

A failed investor from 2017 got drunk and woke up in the 1980s. China is just opening up, and the economy is blooming. There is also the dissolution of the Soviet Union, the bursting of the Dot-com bubble and other financial crisis. He used his knowledge of the future and slowly build up his empire.

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.

An experiment gone wrong, or possibly right? A Nascent Kaleidoscope opens his eyes.

A reincarnated Zelretch story. Previous Fate-series knowledge recommended.

A Fate/DxD/Multi Crossover.

In Light of the horrendous new update, know that I do cross post on Fan Fiction dot Net.

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[Ding! You've gained ten thousand Drug Points! You can now use “Hypnotic Drugs.”][Ding! Due to the host's tendencies, the effects are twice as effective on females.][Ding! Due to the host's tendencies, the effects are three times as effective on females deeply in love with their partners.][Ding! Due to the host's tendencies, the effects are four times as effective on MILFs.][DING! New Mission: Steal the Tech Hammer CEO's wife and daughter.]