Eita Takasugi is a player for Tokyo Esperion's youth team, first appearing during tryouts where coach Tatsuya Fukuda positioned him as a center-back. He contributed to Esperion's 9-0 victory in a friendly against Tokyo Shūrin High. Following the promotion of players including Ashito Aoi, Takasugi joined Team A's regular lineup. Starting as a forward against Kashiwa Dai Business High, his movements created distractions enabling teammates to score the first two goals in a 3-0 win; he also offered support to Ashito during Ashito's debut. Takasugi expressed concern about the talent gap between regulars and reserves, reprimanding teammates Nagisa Akutsu and Yōichi Kiriki for their indifference. He, Kenta Yoshitsune, Akutsu, and Yamada were subsequently summoned to the U-18 Japan national team for matches in the Czech Republic. During national team training, Takasugi and Yoshitsune clashed with Akutsu over Akutsu's disrespect toward teammates, identifying Akutsu's underlying shame about his lack of international impact. After Taira Nakamura announced his retirement following the Funabashi Academy High match, Takasugi argued with Akutsu when Akutsu called Taira "pathetic" and suggested immediate retirement. Takasugi then discussed Taira's situation and the importance of winning to honor him with Kiriki, Akiyama, and Haruhisa Kuribayashi. Named captain for the Funabashi match, Takasugi saw his goal disallowed for offside during Esperion's five-lanes strategy but later scored a valid goal assisted by Tōji Kobayakawa. Following Funabashi's comeback and Ashito's red card, Takasugi mentally faltered but regained composure after speeches from Akutsu and Kuribayashi. In the final moments, he received a pass from Kuribayashi and assisted Akutsu for the equalizer, resulting in a 2-2 draw. Post-match, Takasugi apologized to Taira for failing to create conditions for his participation, while Taira apologized for burdening him. Takasugi then informed Akutsu that Fukuda and the team agreed Akutsu should be captain due to his mental strength, with Takasugi accepting the role of second captain to support Akutsu's social shortcomings. He played in the J-Youth Cup eighth-final against Iwata Allegrio, contributing to Esperion's presumed 3-0 win, and in the quarterfinals against Ganon Osaka, which Esperion lost 5-1. After analyzing the defeat, Fukuda, Takasugi, Ashito, Yamada, and Kyō Shimura confronted Akutsu about losing defensive command. Takasugi started against Aomori Seiran High, having multiple scoring opportunities denied by goalkeeper Eito Makimura before Esperion won 2-1. He also played in the Takamadonomiya Cup final against Ganon Osaka, which Esperion won 1-0, qualifying them for the Alkass U-18 Cup in Qatar. In Esperion's first Alkass Cup match against Barcelona FC, Fukuda designated Takasugi as the trigger for high-press tactics targeting defender David Obsidian. The initial press failed, leading to a Barcelona goal, but succeeded later, enabling a counterattack goal by Kuribayashi assisted by Kiriki. Takasugi possesses a serious yet kind demeanor and inspiring leadership. He prioritizes team success over personal scoring, reflecting his role as a forward who creates opportunities for others. His physical traits include maroon hair and a relatively tall stature.