Sugimaru joined Haruto's Correct 5 with Kaito, Issa, and Airi. Soon after, he began attending Eitoku Senior High. In high school, the Correct conducted "peasant hunts" to force the poor students to quit. Their goal was to restore Eitoku's back to its glory days.
"If we're gonna defeat the enemy, we need to know all about them first. So that's why, I got us these. They'll help us infiltrate Momonozono Academy."
The Correct 5 met Oto Edogawa, when she a accidentally ran in front of their car on their way home. Later, Haruto asked his friends for advice about a girl blackmailing him. Sugimaru was against Haruto following Issa's advice since he the school's "biggest flirt". He "looked into" Momonozono Academy to figure out why the school was more popular than Eitoku. From his research, he learned about the student president Tenma Hase and reported his findings to Haruto. Sugimaru devised a way to "infiltrate" Momonozono. He and Haruto entered disguised as students. However, they were quickly spotted. Tenma protected the other students from beating them up. They left, when Haruto became irritated by Tenma.
Later, Sugimaru, Kaito, and Issa discovered fliers exposing Oto as a commoner. Sugimaru was surprised by the large amount of fliers spread everywhere. The Correct 5 then decided to expel Oto. Haruto declared that he could not bring himself to do it, much to everyone's surprise. Airi promptly left to expel Oto by herself. After Tenma paid Oto's donation, Sugimaru commented that it was "amazing" that Tenma was her fiance. Before one of Issa's flower arranging performances, Sugimaru was astonished that Haruto was unaware of Airi's feelings for him. An hour later, he was shocked to see Oto with Airi, because of her earlier antagonism toward Oto.
Sugimaru: "I knew he wouldn't be able to do it. Faking a romance is beyond him."
Issa: "True, but that's what I like about Haruto. He's so genuine he can't lie"
Like the other Correct 5 members, Sugimaru was shocked to see Megumi "Megurin" Nishidome at Eitoku, when she came to return Haruto's wallet. They were also reluctant to believe that he just accidentally met her in the resort's bath. After the initial shock was over, the Correct 5 brought her to their "Salon". Several days later, Sugimaru and Issa annoyed Airi when they appeared unconcerned about Haruto being absent. The same day, Sugimaru was indifferent about Megumi transferring to Eitoku.
Meanwhile, Eitoku students were being targeted in "Eitoku hunts", which concerned the Correct 5. The school's gates were later vandalized. Oto spurred Sugimaru and the others to help clean it. Sugimaru was impressed by Oto's actions. Later, Kaito confirmed that Haruto and Megumi were "over". Sugimaru commented that "faking a romance [was] beyond [Haruto]". Haruto revealed that someone from Momonozono was behind the attacks on Eitoku attacks. Sugimaru reacted angrily, saying "I'm gonna thrash 'em". Someone then predicted that this would lead to "a battle between [Eitoku] and Momonozono."
Haruto vs. Tenma
"And it's not just your neck on the line! You two are the leaders of your schools. To the rest of the world, this looks like a battle between Eitoku and Momonozono."
After Tenma challenged Haruto to compete against him at the "Manly Man Festival", he went to Sugimaru for help. He attempted to convince Haruto to back out of it, describing Tenma as being "out of [his] league". When Haruto refused to quit, Sugimaru told him that it was a huge risk since this was like "a battle between Eitoku and Momonozono." He and Haruto then went to Sugimaru's family's dojo in Kyoto, where they began training vigorously. On the day of the competition, Sugimaru was surprised to see the stadium filled with students from Eitoku and Momonozono. Hitoshi Konoe, a Momonozono student, then revealed to him and Haruto that the festival was going to be broadcast on television also.
In the first round, Sugimaru advised Haruto to not "engage", having taught him a particular strategy earlier. He was unable to implement the move and was taken down by Tenma. Before the second portion, Sugimaru reminded Haruto that he had to pass this round in order to win the competition. Like the others, he displayed a lack of faith in Haruto. They were all shocked when he managed to best Tenma. Haruto then won the contest, after Tenma did not show up for the final round. Afterwards, Sugimaru stated that "it could [have] ended really bad" to Airi, Kaito, and Issa. The next morning, he went with Kaito and Issa to pick up Haruto. He had been waiting a whole day for Oto. Sugimaru and the others then helped Haruto get back to Tokyo.
Changes at Eitoku
"I just found out something important! The tour operators didn't do a head count at the start of the tour. And they never took roll call when moving to the next spot. This is bad! Haruto and Oto Edogawa, if they're not here then they may have been left behind in the ocean."
During Christmas, Sugimaru competed in a judo competition in Hokkaido. He returned to Tokyo to spend New Years' Eve with his friends. When Haruto revealed that he stopped training, Sugimaru said "what a waste after you trained so hard." Kaito made an announcement about "join[ing] forces" with Momonozono. Sugimaru readily agreed to the proposal. After the partnership was formed, the two schools began having joint classes. Sugimaru gained some fans among the martial arts enthusiasts of Momonozono. During this time, he also noticed a change in Haruto. Sugimaru later attended the joint summer school between the schools. He and some of the others went on Megumi's yacht the first day.
Upon returning to the resort, Sugimaru announced that he was "starving." He quickly forgot this, when the group noticed that Haruto was not back yet. Sugimaru learned that the tour operators failed to do a head count or take a roll call. He surmised that Haruto and Oto had been "left behind in the ocean." Thankfully, the two were brought back by Airi and Tenma. Haruto decided to return to Tokyo that night. Two days later, Oto left the resort. On the tarmac, Sugimaru noticed that Airi, who was talking to Tenma, was turning red. The next day, Sugimaru, Kaito, and Issa went to Hawaii. He recalled that Airi had suggested it for Haruto's birthday party. Neither ended up going. Issa decided to go find some girls, but Sugimaru declined to no train instead.
After their vacation was over, Sugimaru and Issa visited Haruto. He surprised them by revealing that he was dating someone, namely Oto. They began asking for details on how it happened. Haruto's answers were not exactly convincing, leading Sugimaru to state "That's not dating!" Later, Sugimaru was helping Haruto work out, when the latter revealed he was planning a festival for Oto. He and Issa teased him about it. Haruto then told them about some of his problems with Oto, to which they exclaimed "That's not dating." He and Issa attended Haruto's festival. There Sugimaru let slip Haruto's worries to Oto. Later that night, Sugimaru accidentally interrupted Haruto and Oto who were alone together.
The second semester of school started and the Correct 5 gave a greeting to the student body, excepting Airi. Afterwards, Kaito confessed his feelings to Airi. Sugimaru and Issa were both struck speechless by this development. Several days later, a welcome back party for their old friend Amei was held at Issa's house. Sugimaru was struck by how "different" Amei was, compared to her former "sickly and weak" self. By the end of the night, Amei, Haruto, and Airi had disappeared from the party. Sugimaru insisted on a rematch at pool, despite already losing several times to Issa. The next morning, the Correct 5 arrived at school with Amei. While showing her their "Salon", Haruto received a text from Oto about her father wanting to meet him. Sugimaru's advice was for Haruto to say "Please let me have Oto's hand in marriage."
Later, Haruto reported to his friends that the meeting went badly and he needed a "do-over". Hanging out later, the guys asked Haruto more about Oto's father. Issa commented that he had not seen Oto lately. That night, the four guys were going out together when they noticed her with Tenma on a news program. Sugimaru, Issa, and Kaito stood in shock, while Haruto rushed off and ordered a private jet. They later followed Haruto to Los Angeles, deciding on a whim when Airi declared she was going. That morning, they went to Momonozono's LA campus and were given a tour by Tenma. Sugimaru later proposed a game of basketball, forcing Issa to play on his side.
Sugimaru had a "nice body", as described by an envious Haruto, and well-toned muscles from working out constantly. He had spiky, black hair and almond-shaped eyes. Sugimaru was frequently seen wearing work-out clothes, when he was not at school in his Correct 5 uniform.
Personality and traits
He was extremely athletic and worked out daily for two hours. Sugimaru said he felt "gross", if he did not work out. He first became interested in fitness as a child, which was probably when he began practicing martial arts. He was adept at kendo and judo. His idol was the famous martial artist, Bruce Lee. Unlike his friend Issa, Sugimaru had no interest in dating or romance, saying "Brawn before babes."
Viz misspelled his name as "Sugimaru Ebisu" in their first release of chapter one. His name was corrected in the following chapters and the volume release.
Keisuke Nakata portrays Sugimaru in the 2018 drama, Hana Nochi Hare: Hanadan Next Season. A man of few words, he often quotes famous sports figures at opportune times. Sugimaru and Issa are also occasionally used as comic relief. Like his manga counterpart, he is obsessed with physical fitness and has little interest in romance.