Onii-chan wa Oshimai! - Oyama Mahiro - Zenryoku Zoukei (System Service)Oyama Mahiro · System Service

System Service presents Oyama Mahiro from Onii-chan wa Oshimai! as part of their Zenryoku Zoukei figure line. Standing approximately 180mm tall, this figure captures the character in her transformed state as a middle-school-aged girl. Mahiro Oyama was originally a reclusive otaku and older brother who had not left his house for two years, spending his time playing eroge and reading noncon hentai manga. His younger sister Mihari, a prodigy, transformed him into a middle-school-aged girl through one of her experiments. Initially resistant to the changes—going outside, showering regularly, and following new rules—Mahiro gradually adapted, with her old personality fading as she embraced life as an adorable younger sister. Her love for video games remained a constant, and she developed a talent for composing haikus about her daily life. Spending time with Kaede and Momiji helped her overcome the social anxiety she had developed as a shut-in. The series explores the reversed dynamic between Mahiro and Mihari, with Mihari now caring for her older sibling in a new form. This System Service Zenryoku Zoukei figure stands at 180mm tall and depicts Mahiro Oyama from the anime series Onii-chan wa Oshimai!