The Regressor Can Make Them All - Chapter 349

In the Central 46 Compound, the Captain-Commander of the Gotei 13 and the notorious scourge of the Female Shinigami Association, Masatsuki Aozaki, stood before the Sages and Judges.“You have improper relationships with numerous members, Seated Officers, and Captains of the Seireitei?”“As Captain-Commander, maintaining close relationships with them helps facilitate my work.”“...”The Judge narrowed his eyes. “Then how do you explain modifying the female Shinigami's Shihakushō into miniskirts?”“To transform the Seireitei into a perfect paradise.”“Tsk tsk… A paradise for all Shinigami? That’s not entirely unreasonable…”“No, a personal paradise.”“A private—wait! Captain-Commander Masatsuki, that kind of thinking is clearly wrong!”“Do you want to die?”“...”“Forget it, Captain-Commander Masatsuki. We’ll set this matter aside for now. Let’s discuss some of the outrageous statements you’ve made in the past. Those were jokes, right?”“No, I was completely serious.”Masatsuki calmly ran his hand along the hilt of his Zanpakutō and spoke with conviction. “I have a great relationship with my subordinates, I get along well with Hueco Mundo, and I’m even friends with all of your wives and girlfriends. But rest assured, I’m a good Shinigami. You can safely leave the world in my hands!”Genryūsai Shigekuni Yamamoto: That damn brat! Shunsui, Jūshirō, don’t stop me—I need to teach him a lesson!Thus begins the tale of the most incorrigible Shinigami!

Year 2056, in a city in the Yuan Jiang Su Jin area. On top of a ruined, shattered six story residential apartment sits a teenager wearing a combat vest, militaristic trousers, and alloyed battle boots. On his back is a hexagonal shield and equipped is a blood-shadow battle knife. He sits there silently on the edge of the roof. At this time, the sparkling sky was shining and there was a refreshing breath within the air that blew towards him. However, there was only silence within the ruined, deserted city, with an occasional howl that makes your heart skip a beat.

- Description from novelupdates

In a world teeming with Titans, Colossals, Gigantic Monsters and Kaiju's, Erian who reincarnated makes his living collecting scraps of low-grade Defective Genetic Serum, realised he transmigrated along with his system.

Follow Erian as he grows to become the strongest Disaster Grade Titan with the help of his Titan System!

Yuan was born with an incurable illness that left him blind at a young age and crippled a few years later, rendering everything below his head useless. Deemed hopeless and irredeemable, his parents quickly gave up on him, and the world ignored him.