Roakijushiku is the Crystal Monster character from the Shuriken Rantō Cryptoverse series created by Fujima Kunisada. He is Koji‘s Crystal Monster, who bonds with him to form Kojiroara, and also debuting in BangBang Comics, Issue #5 (2021), with the title, Rough At the Beginning (åããã¨ã«å¤§ã¾ã㪠Hajime-goto ni Åmakana). Roakijushiku is Koji’s Crystal Monster in the “Shuriken Brawl Cryptoverse” series. Roakijushiku is also based on the same character from the “Crystal Jewel” series, both with the same characteristics, with four legs and abdomen with gray skin.
In the first chapter in which he appeared, he surprised Koji by sensing a crystal ball when he broke into the window. Roakijushiku and Koji cooperated to defeat the powerful crystal monster Darkslash, and that Crystal Monster ended up defeating Koji and Roakijushiku. However, despite being defeated in the first battle, Roakijushiku discovered a fusion with Koji on the first day of school. In Chapter 3, Roakijushiku revealed to Koji that he had met a Ferocious Five before when Koji claims that he is going to help them collect all of the Crystal Balls. Even though Roakijushiku tried to warn him about this, he still ignores him.
This means that he may have been kidnapped when he first met them. In Chapter 4, he met Plantmore, where she helped Crystal Brawler take care of Human Flight Wrap. Chapter 15 also revealed that he may also remember Hunter Gray. In Chapters 17-18, he and Koji trained for 14 days before facing the Furious Five. However, on the day of the invasion, he and Koji are instead tasked with collecting the three stones of Chapters 19-21. In Chapter 21, he merges with Koji again to fight the giant snake that robbed them of the yellow ball. But giant snakes wrap them around so they don’t move.
Roakijushiku seems to be very familiar with Koji, but sometimes suffers from his time-consuming thoughts. Roakijushiku seems to be very calm in a relaxed situation and, despite not taking the situation very seriously, becomes very serious about the situation. He also sleeps fast as he gets very comfortable in his bed. Since Roakijushiku is also compatible, we have relied on Crystal Brawler from the beginning. Thanks to the crystal ball, Koji would rely on him, but he prefers to handle the situation himself rather than relying on him. It was also implied that Roakijushiku was born somewhere in the Jarbon region. Roakijushiku is also a shuriken crystal monster with the supernatural powers of a simple shuriken that can be used in battle. His eye color is also blue.