Bullet Diaries Description:

An American assassin, code-named Ladybug, is in Tokyo, and his mission is to snatch a briefcase from a bullet train going to Kyoto. The briefcase was with two other assassins, Tangerine and Lemon, who had the custody of a mighty assassin’s group leader White Death’s son. When Death’s son gets killed during that train journey, they all realize that it wasn’t just them on that train who had other plans. The eventful trip of these people to Kyoto with so many unexpected twists is what we see in Bullet Train.