The New King of Kita [新・キタの帝王]

Hotondo is a capable lawyer who is about to marry his girlfriend Mayumi. However, during a trial, Mayumi is involved in an accident and tragically dies. Hotondo investigates the suspicious circumstances surrounding her death, but falls into a mysterious trap and is sentenced to two years in prison. Two years later, Hotondo is released and discovers that the medical corporation Atsumito-kai is involved in Mayumi's death.