World's Greatest Tag-Team

Formed within Team Shibata, Ryuichi Tatsuno began to call himself and his "tag-team" partner, Masaru Ichihara, by this name after they took out multiple genin in the Chunin Exams. They later went on to defeat many other ninja such as Sakon and Ukon, Kabuto Yakushi and Orochimaru, several Iwagakure, Kusagakure, Sunagakure, and Otagakure ninja. After their joint training with Shibata's Father, they grew to be an even better team and took out Akatsuki member Sasori. Their last battle together was against Hidan and Kakuzu of the Akatsuki,where Ryuichi suffered fatal internal wounds and died on their tenth "bromanciversary". Masaru would go in to avenge his comrade by incapacitating Hidan and delivering the final blow to Kakuzu's last heart, stating he finished the both of them with Ryuichi in his corner cheering him on.

Later in the Fourth Shinobi World War, Ryuichi was reanimated by Kabuto and forced to fight his once teammate. During the fight, Masaru couldn't bring himself to trade blows with his fallen comrade, stating he couldn't stand to see him die twice. After being saved by his sensei, Shibata Takamitsu, and teammate, Hinako Fukushima, he once again apologized to Ryuichi.

Years after the war it was revealed that Masaru and Hinoka later had a child they named after their fallen comrade, Ryuichi Ichihara. They also went to his grave sight on Masaru's birthday due to the fact that they were married on the former team's "bromanciversary", which Masaru apologized for.