Kouichi Aizawa (相沢 洸一) is father of Keiichiro Aizawa in manga and anime of Wangan Midnight and he drive Toyota Celica Supra XX. Kouichi died by car accident 15 years ago prior the start of Monster Machine arc in Wangan Midnight as he appears via flashback only.
He brief appeared as flashback in Chapter 30 of Wangan Midnight Maximum Tune 4 onwards.
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Manga[]
Anime[]
KouichI Aizawa (anime)
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Koichi's Celica XX in WMMT (flashback)