Arika Yamamoto, a former Saitama University student of Professor Ikeda, transitioned from science to become a manga artist. She possesses light violet hair, aubergine-colored eyes, stands approximately 1.65 meters tall, and has blood type B. Typically dressed in uniform-style clothing, she wears a beret and glasses, carrying a bag with her manga tools. Introduced in Season 1, Episode 8, she arrives at the university, financing her participation in Professor Ikeda's research trip to gather material for a manga about researchers Yukimura Shinya and Himuro Ayame. Though outwardly friendly, Arika manipulates real events for compelling drama, exemplified by breaking a duplicate glasses case meant as a reconciliation gift from Himuro to Yukimura and replacing the original to create conflict. After Yukimura discovers the deception, Arika explains her pursuit of narrative tension and reveals Himuro's location. She returns in Season 2 to further observe the lab for her manga. Arika participates in relationship theory discussions, offers story ideas, attends the Saitama University festival, and wears a girlfriend-style dress during the festival's cosplay event when invited. She gathers manga references about love to share with Yukimura and Himuro, modifying elements of their real interactions for her work. Arika frequently evades her manga editor, implied to be due to deadlines and her need for breaks. Her name combines "亜" (second/Asia), "梨" (pear), and "華" (flower/petal) for "Arika," while "Yamamoto" means "mountain base."