Toaru Majutsu no Index - Volume 1, Prologue: The Tale of the Illusion Killer Boy. The_Imagine-Breaker.

Revere knowledge, pursue truth, control fire, command frost, manipulate lightning, ride storms, enslave the undead...Spreading ancient prophecies and curses, known as the wizard.“Immortal Phoenix Bloodline + Ancient [Eternal Life] Rune...”“After forty million sunsets, I shall finally attain immortality!”

On a certain day, Xu Xing suddenly received yin-yuan eyes; he could see a red string between lovers. Then he discovered that he had a tight connection to his own left hand.

Xu Xing: I TM …… will I be ‘solo’ for life? : )

The second day.

Xu Xing suspected that he had seen a pair of ‘gay’s. The left side of the boy’s body had two red strings. The one in front was tied to his hand, the one in the back was tied to the boy’s right side.

The bottom of Xu Xing’s body suddenly tightened. Trembling in fear, he turned his head — only to see his ‘local area’ connected to a red string tied into a beautiful, intimate bow that was attached to the school grass sitting behind him ~

Xu Xing: Excuse me???

- Description from Novelupdates

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.

Xiao Zheng was forced into signing a marriage and employment contract after a one night stand with the female executive of New Arcana Group.

During this time, he encountered many interesting female workers which he named them based on their unique characters…

Ice Goddess… Tyrannosaurus / Overlord Flower… Gentle Boss… Mischievous School Girl…

- Description from Novelupdates