Sakamoto Days

What is Sakamoto Days about (plot, summary)
Taro Sakamoto used to be an unrivaled hit-man, earning legendary status in the underworld. But one day, the unthinkable happened. Sakamoto fell in love.
Taro Sakamoto used to be an unrivaled hit-man, earning legendary status in the underworld. But one day, the unthinkable happened. Sakamoto fell in love.