Nakai is a manga artist, and a former assistant of Eiji Nizuma's. He won a monthly award ten years before his introduction in the story, and has since been determined to get serialized and find a girlfriend. He is good with drawing backgrounds and angles. He originally started as a assistant for Eiji Nizuma and then turned into an assistant for Kō Aoki, who he was attracted to, for Hideout Door. Once the serialization ended, he confessed his love for Kō but was rejected. He eventually showed up again as an assistant for Takahama, who as an assistant for Muto Ashirogi who got serialized. Eventually, when Kō asked him to draw for her, he told her he would, on the condition that she became his girlfriend. Kō slapped him and told him to never speak to her again. After Takahama's series was canceled, and being rejected by another girl who was assisting with him, he gave up and returned home, despite protests from Kō, Shinta Fukuda(Who was another assistant with him for Eiji) and both Mashiro and Takagi. However he eventually comes and becomes Nanamine Toru's asistant for his work "What is required for a good school life"
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