Birthday: 29 February
Sumio Haiba is the only son of Mina Haiba and his unnamed father. He is the main protagonist of the nigm series and was chosen by his old childhood friend, Kirio Imizuka, under the alias of nigm, to attend the fifth e-test. As of the end of the e-test, he has taken over possessing and taking on the identity of nigm from Kirio.
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