Youichi Arikawa, known as 有川 ヨウイチ in Japanese, is a central character in the anime series 'Kuzu no Honkai' (Scum's Wish). He is a music teacher at the school attended by the series' main characters. Known for his calm and gentle demeanor, Youichi is admired by many of his students, including Hanabi Yasuraoka, who harbors a deep crush on him. Despite his seemingly perfect exterior, Youichi is a complex character with his own vulnerabilities and secrets, which play a crucial role in the unfolding drama and emotional entanglements within the series.