[Nagumo Ryuichi] Oyama Mahiro no Mesuochi Haramase Shussan Jikken! | The Case of Oyama Mahiro's Fall, Pregnancy and Childbirth![Nagumo Ryuichi] Oyama Mahiro no Mesuochi Haramase Shussan Jikken! | The Case of Oyama Mahiro's Fall, Pregnancy and Childbirth!