Masakiyo Ogi (小木 正清 Ogi Masakiyo) was an English teacher at Kaburaya Middle School.
Hōtarō's first impression of him was that he was a little weird. He likes mountain climbing.
He has mildly wrinkled skin, black hair, somewhat droopy gray eyes, and wears yellow-framed oval-shaped glasses.
He taught English to Hōtarō, Satoshi, and Mayaka while they were in middle school. He claims to have been struck by lightning three times. Also, when a helicopter was on his way near the school, he suddnley stops the lesson, went to the window and watch it till he can't see the helicopter anymore. Then he usually laughed, apologized and resumed the lesson, as claimed by Hotaro. This thing happen several times.