Also known as: レベル0合気道, レベル0で最強の合気道家、いざ、異世界へ参る!
The Strongest Level 0 Aikido Practitioner, Now, Here I Come to a Different World! is a 2015 fantasy, martial arts web novel, written by Sorachi Daidai and illustrated by Ketuyuki Tamon.
Can be read here