One of Mashiro's classmates. After discovering Mashiro's talent in drawing, he proposed that they try to publish a manga together. Although Mashiro originally refuses, the two begin to work together after he takes Mashiro to Azuki's house and Azuki and Mashiro decide to get married after their dreams come true. He eventually dates and becomes engaged to Azuki's best friend Kaya Miyoshi. Takagi is a writer and writes the storylines for the pair's manga.