When system cheat becomes rampant! - Chapter 12 - : Learn by Analogy

Born with RH-null blood group, living among the extraordinary vampires, who could perform wonderful feats and possessed magic...Kayden was simply an incapable vampire!

On the halloween night in his school, Kayden explored the biggest perk which came with his incubus blood!

“So, I can charm girls and make them yearn for my touch!? From where should I start now?”

Pairing up with his succubus partner he was determined to find the cause of his mutations. Until unnatural murders occurred from his wrong touches!

Intimacy, blood, life force, he has all the options to stand atop of everyone. Unbeknownst to him that his peculiar blood is desired by all the existing races, as powerful elixir!

Jiang Xunyi had transmigrated into a book many years ago, and always tirelessly maintained the requisite accomplishments for a villain.

After finally completing the ultra-difficult task to allow the male protagonist to kill him, an OOC warning had appeared out of the blue——

Error in the actor’s lines, the character role has collapsed, the assigned task has not yet been completed, opening the Rebirth System!

So, he gloriously became… a second idiot son about to be sent to his death.

Lazily idling away the days after changing his identity, he noticed a world-changing difference.

His best friend, the male protagonist, Yun Xie was actually secretly in love with him? Are you kidding me?!

- Description from Novelupdates

This stands at the forefront of strategy guides to Life (a shitty video game)!

as a gamer, who knew the powers will be diversified in the world of Pirates and Navys?this is a story of a person who is thrown into the beautiful, but dangerous and horrendous world of One Piece, as the Holder of the System with the Job of a Gamer.