*The art is made by hosimorii on twitter* Life in U.A. High School is hard for one Jiro Kyoka. She couldn't show her love for music to her classmates, as none of them have any interest. With all of the training, villains attacking, and studying, she has no time. But that changed one day, a day that will change her life forever. This will be an AU where some characters will have different personalities, relationships, etc., and as for the Villians, just keep an eye out on their roles. ;)

Izuku is kidnapped at a young age and becomes the Ultimate Lifeform Project name SHADOW. Watch Izuku become a vigilante and then a learn how to become a hero at U.A. And learn how to interact with society and try to understand what these feelings are twords his female class mates.

In a world where there are gates to mysterious dungeons and heroes who enter them and defeat the monsters within, Izuku once entered a dungeon which was never seen or heard of, a 'Double Dungeon'. In it, events happen and Izuku gets the power to level up! What happens next. Read to find out. Under rework. Reworked chapters marked with (*). Ever wondered what it would be like if Deku had the power of leveling up from the manga and light novel 'solo leveling'. In this he gets the power of the protagonist of 'solo leveling'. This might spoil some details of the manga to those who haven't read solo leveling. also...sorry if it gets a little dark sometimes. The art and drawings shown are not mine. My hero academia belongs to Kohei Horikoshi and solo leveling belongs to Sung-Lak Jang. I only own this plot.

WARNING! If you haven't read mark of cain by me, I suggest you go read that before you read this. This is the second story of mark of cain, and I know you guys have been waiting for it. kyoka woke up one morning and looked to her side, then saw no one there. "I still can't believe he's gone.." she mumbles while getting up from her bed. kyoka got ready for the school day, just like any other day.... With tiredness and a lack of happiness to do anything. She looked at her phone and notices something, then she sighed. Today marked the second year of izuku being gone. He couldn't teleport to see her and he couldn't even text because he didn't want the chance of a demon to find her. She was supportive about this whole thing at first, but after the first month she was a mess. She didn't know how much she loved him until he left. Kyoka finished getting ready and made it to school, and the classes were boring as usual, she barely survived until homeroom. Aizawa was talking about hero stuff and kyoka was kind of listening. She looked up to the front and sighed. Then, out of nowhere, izuku falls in front of the class all beaten up. "w-what the hell just happened?" she thought, then ran up to him and picked his head up. He wasn't healing right a way, so she looked down to his forearm and saw the mark was gone... anyways if you want more you should read it you know?