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Mahiro Oyama (緒山 (おやま) 真尋 (まひろ) , Oyama Mahiro) is a former otaku slacker and the brother-turned-sister of Mihari Oyama, having been transformed into a middle-school aged girl by one of Mihari's experiments. She is voiced by Marika Kōno in the anime. Mahiro's appearance as a guy directly before...
Mahiro Oyama | Onii-chan wa Oshimai! Wiki | Fandom