Ôtsuka Ryûnosuke was born as Lösch (Loesch) Markus in Munich, Germany. Since his early childhood he was fascinated by martial arts and Japanese culture. In order to completely commit to learning the use of the Japanese sword, he even quit his longstanding training with the English longbow.
At that time no traditional Japanese sword-fighting school (koryû) was present in Munich or its vicinity, so he first started Musô Shinden-Ryû, a modern style of sword-drawing (iaidô). Since he was not satisfied with the teachings of this modern martial art, due to the lack in practical application, he moved to Japan in 2010 to study a real koryû directly at its source.
Due to his quick grasp of techniques and exceptional devotion Ôtsuka Ryûnosuke was accepted as an uchi-deshi (private pupil) by Ôtsuka Yôichirô Taira no Masanori, a menkyo-kaiden ranked shihan (master) of the Hokushin Ittô-Ryû.
From the moment he became the uchi-deshi of Ôtsuka Yôichirô Taira no Masanori sensei, Ôtsuka Ryûnosuke spent his time intensively with the training of the Hokushin Ittô-Ryû for several hours per day, which enabled him to quickly improve his techniques and become furthermore fluent in the Japanese language. In July of 2013, Ôtsuka Yôichirô Taira no Masanori was appointed the 6th sôke (headmaster) of the Hokushin Ittô-Ryû Hyôhô by Chiba Hiroshi Masatane, the 5th sôke of the school.
On the 26th of March 2016 Ôtsuka Ryûnosuke was officially appointed the 7th sôke of the Hokushin Ittô-Ryû Hyôhô by the 6th sôke Ôtsuka Yôichirô, together with the 5th sôke Chiba Hiroshi. Ôtsuka Yôichirô officially retired after the appointment of his young successor and became sendai-sôke (previous/retired headmaster), fully entrusting the leadership of the Hokushin Ittô-Ryû Hyôhô in Japan and abroad to Ôtsuka Ryûnosuke.
As the official successor of Chiba Shûsaku, the school’s kaiso (founder), Ôtsuka Ryûnosuke spends several months a year in Japan and abroad, in order to spread the teachings of the Hokushin Ittô-ryû Hyôhô worldwide.