The story is of a half saiyan from the Dragon Ball universe who accidentally was transported to the DxD universe after the fight with Zamasu.
When Goku and his friends escaped Grand Zeno's erasing after the defeat of Zamasu, he accidentally slipped...
We see a vast forest of trees and a clear lake. Right next to the lake is y/n sitting in a meditative position while floating in the air.
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The entire environment is peaceful with birds chirping and the river running towards the lake. Y/n really loves nature and he loves animals which is why y/n is currently now learning senjutsu. A couple of weeks ago he found a book about senjutsu in Bithiah's study and he asked what it was. She told him it's a form of technique that the yokai in japan have created many years ago to become one with nature. When y/n heard this he was ecstatic to learn it so he asked Bithiah if she can teach him. Sadly she didn't know how and said that only yokai have mastery of it so she wasn't much help.
So y/n decided to take it into his own hands and try to master senjutsu on his own, but Bithiah forbid it because learning senjutsu can be very dangerous and many people have actually gone insane trying to use senjutsu. So being the battle nut that he is, he enjoyed a good challenge and decided to try and master it on his own. So on weekends when there is no school he flys to a far and secluded location to try and master senjutsu.
Currently y/n is in Yellowstone national park in the U.S. He has been meditating for hours to try and pull natural energy into his body and let it flow through him. He's had years of experience trying to master his KI and with his knowledge on it he can get a basic understanding of senjutsu.
In order to master senjutsu, you don't just pull the natural energy into your body and keep it there. That would be very dangerous and could either cause you to go insane from the power being stuck in your body and mess with your mind or it can turn your body into stone as all the natural energy slowly corrodes your cells in your body and turn them to stone.
So y/n understood that in order for someone to master senjutsu, you must let the natural energy flow through you and out until it's properly regulated. Right now y/n is getting the hang of it, he has now mastered having the natural energy flow through him like water through a river.
Y/n: *thoughts* Hm, having the energy flow through me is like wind flowing through my hair. If i properly let it flow through me then it can allow my body and senses to be heightened to a higher degree than before. I'm already able to sense life forces, but with natural energy i can sense everything in nature, that includes plants. Also it strengthens my body and makes it tougher, this could be very useful in the future.
As he was using senjutsu, unknowingly he was also purifying the natural energy all around him. His pure aura was mixing in with the natural energy all around him and purifying all the negative energy from the earth. Around his body, flowers started growing and blooming, the water near the river was becoming clearer and the fishes started swimming peacefully. Also the animals were coming from the woods and sleeping near his floating body feeling safe and warm from his senjutsu.
As he was meditating, he sensed multiple dark signatures coming towards his direction. He snapped out of his trance and saw all the animals and plants around him.