Dibunuh oleh raja iblis, seorang pahlawan tiba tiba bereinkarnasi menjadi murid Nakal di akademi sihir.Kini ia ia akan berjuang membuat kehidupannya sebahagia mungkin, sebagai ganti penderitaannya di kehidupan yang lalu
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Len Kagamine was an ordinary little boy who has gotten back from the dentist. His mother wishes to give him a treat. So she brought little Len to the toy shop. He found a battered doll with scratches and cracks. And a peculiar bandage around half of it's face. Pail blonde hair. He decided to name him, Oliver.
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