Masashi and Yasushi are twin brothers who were feared among Suzuran. Their current residence is home to Renji Mutou, Tominaga Toranosuke, Sakota Takefumi, Takumi Fujishiro and Suzuran's first leader, Hana Tsukishima.
The Umehoshi brothers were infamous since middle school and were well known when they started at Suzuran. When they entered Suzuran, Kuroi, leader of the biggest faction in Suzuran at the time, made alot of comments how he was going to make short work of the Umehoshi brothers after they enrolled. The brothers easily defeated Kuroi, but their actions had repercussions. Their attack on Kuroi had made them enemies with sophomores and seniors as the older students felt their pride had been hurt. There was not a day that went by without blood being spit. Yashiro Keiji and Mori Yoshio, old middle school friends and freshmen at Suzuran, were part of their group and fought with them against the seniors and sophomores. Their entire first year revolved around them fighting for a place of their own where they could be free without joining any faction. At the end of the year, the Umehoshi brothers toughed out the attacks by the upper-class members and became a force of their own, the Umehoshi-Gumi
By the time the Umehoshi brothers became sophomore, Their position was firmly established. At the rate they were going, everyone was sure that the Umehoshi-Gumi were going to be the first to achieve complete control over Suzuran. However, There can only be one leader of Suzuran and not two. When a freshman underling of the Umehoshi-Gumi, Aoki, brought up the topic, he asked the brothers which one was the strongest. After that, the brothers got into an argument and from then on would always compete against each other claiming themself better than the other. The Umehoshi-Gumi was split in two. Despite the competitiveness between them, they never hated each other and shared a strong bond.
In their senior year, the Umehoshi-Gumi split in two and at that time, Suzuran's enemy, Housen, appeared in front of them. Chinen Ryuutarou was the leader of Housen and an old class mate in middle school of the Umehoshi brothers. His position was challenged and taken by sophomore Nikaidou Takuya. Takuya next set his sight for the Umehoshi brothers and Suzuran. When Masashi and Yasushi went their seperate ways, Masashi was ambushed from behind. a telepathic link between the twins notified Yasushi that something was wrong with Masashi.
When Nikaidou group are beating up Masashi's friends, Masashi comments how this is how he beat Chinen, by ganging up on him with weapons. When Nikaidou tells Masashi how Umehoshi's loss to Housen's Nikaidou with be the truth that will spread through town tomorrow, Masashi responses by farting, stating that all his bullshit is making him fart. Before Nikaidou can swing his iron pipe at Masashi, Yasushi arrives. Yasushi starts arguing with Masashi and Nikaidou gets angry that the brothers are looking down on him. Yasushi tells Nikaidou that Chinen and Masashi don't need the hardness of an iron pipe, they use their own hardness and that beating them with it doesn't amount to amount to anything, adding that no one thinks of him as a badass.
When Yasushi asks the other Housen students if they have even seen Nikaidou fight without a weapon and if he is a better leader than Chinen. The housen students start doubting Nikaidou. Nikaidou throws away his iron pipe and goes straight for Yasushi, where Yasushi knocks him out with one punch.
Yasushi went over Nikaidou and told him, ''There's only one man in this world that can beat Masashi, and that's me! dumbass!''
The Umehoshi brothers still consistently compete against each other, even after they graduated.
The brothers live together in a house where they lease out their rooms to students. Masashi is now a landlord and Yasushi is a cross-dresser and goes by the name Mary.
Mutou Renji, Toranusuke Tominaga, Takefumi Sakota, Takumi Fujishiro and Suzuran's first leader, Hana Tsukishima, previously resided here. The brothers acted as their guardians and helped them out when they had problems and gave them advice.