Shinnosuke (nicknamed "Shaggy Hair" by Kenichi) was an ambitious rival of Kisara's, often getting into arguments with other members about who was stronger. Though he has a rougher fighting style and fewer techniques than Kenichi, his fighting experience more than makes up for it. He had hoped to one day lead a gang stronger than Ragnarok, but his dreams were crushed by Kenichi's logical thinking. He initially had hordes of men as followers, but after he was beaten by Kenichi's unintentional sneak attack, he lost all but two of them. Tsuji was angry at Kenichi at first, but calmed down when his two remaining followers stated that they stuck by him because he was their friend. He grows a bit of respect for Kenichi, and even informs him of Takeda's impending punishment at the hands of Ragnarok, and warns him of Hermit.
Following his defeat by Kenichi, he goes into the mountains to train. He finds a master, who is a large old man wearing a bear skin over his head that stretched down to his legs. He then decided to teach Tsuji his style of martial arts which is Koppou, in exchange that Tsuji has to leave the mountains. According to Kōetsuji, this is a style that is possibly over a thousand years old and is one of the oldest japanese styles of Kenpou and which it revolved around the kanji 昒, which means in japan today, talent or skill to understand a clever technique in little time. However, in olden japan, Kotsu meant "core", which was for people the difference between those who knew the "core" and those who didn't was in their understanding. Kōetsuji, also said that Tsuji's way of Koppou was a little different from how it is used in regular styles. One of the techniques that he had learned were "Tooshi" or as the the Elder called it, "Koppou no Tooshi" which means "pass through", it is a move that uses the palm to disrupt the brain and cause a concussion. Tsuji was able to obtain a victory - of sorts - over Kenichi before Kenichi left for the D of D tournament. He then runs away refusing a rematch saying that he's going to hold onto the victory for the rest of his life and never fight Kenichi again. His skill has changed considerably but Kenichi can dodge it well. He also appears to harbor a crush on Miu. It is currently unknown where is however, he is most likely with his master in the mountains continuing his training.