The Dungeon Seeker - Volume 3 Prologue

The world is governed by the Seven Legendary Heroes, their authority absolute and unchallenged even by their own descendants. They manipulate the world and its people according to their whims.Jonan, son of one of these legendary heroes, discovers his affinity with crystals and mastery over flames, yet lacks skill with weapons, which brings shame upon his family. As he delves deeper into the dark secrets connecting the heroes' power to the rifts and an ancient evil lurking, waiting for the right time, Jonan must move forward with unwavering determination.

Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.

-Do you think that your fire is very powerful? I have the burning fruit.

-Do you think that your thunder is very powerful? I have a thundering fruit.

-Do you think that your otter is very powerful? I have the frozen fruit.

-Did you said you want to die? Don’t worry, I also have a nickname: Death Doctor.

- Description from Novelupdates

I, Hyoudou Issei, am a 2nd Year High school student and my age is equal to the number of years I haven’t had a girlfriend. And, someone like me got a girlfriend! I’m sorry buddies, I will walk the path of becoming an adult before you guys! – That’s how it was supposed to be, but why did I get killed by my girlfriend!? I still haven’t done anything yet! Are there no Gods in this World!? And, the person who saved me is the most beautiful girl in my school, Rias Gremory-senpai. I learned the shocking truth from her who isn’t a God but a Devil. “You have reincarnated as a Devil! Work for me!” Lured by Senpai’s breasts and treats, my life as a reincarnated Devil began. So the “Academy×Love Comedy×Battle Fantasy” starts here with just aggressive and worldly desires!

The young man named Kehma who was summoned to another world, and the useless Goddess Laura whose only strong point is having huge breasts.

Gaining a cheat skill that absorbs the abilities of what he eats, he enjoys his new adventurous life eating delicious monsters and playing with the easy to handle Goddess, all while becoming wildly overpowered/peerless in this otherworld fantasy.