Banba and Lin have decided to clean out the Kakyu Association executives from Fukuoka. Meanwhile, Nitta is negotes with an organization vying to gain a foothold in Japan. It’s an opportunity for Saruwatari to become their exclusive assassin. As a condition of the agreement, Nitta is asked to eliminate Kakyu Association executives… With their executives being killed, the Kakyu Association brings in a capable assassin from the mainland. That assassin, calling himself Fei-Lan asks only for the association to find someone as his compensation.
I heard the Submarine Ninja is a 
friend of yours from high school.
سمعتُ أن النينجا الغوّاص هو صديق
لك من أيّام المدرسة الثانوية
Ich hörte, der Submarine Ninja
Escuché que el ninja submarino
es amigo tuyo de la infancia.
He oído que el ninja submarino
es amigo tuyo de la infancia.
Ho sentito dire che il Submarine ninja 
è suo amico sin dalle scuole superiori.
Eu soube que o Ninja Submarino
é um amigo seu do colégio.
Я слышал, что этот ниндзя Субмарина —
твой друг со времён старшей школы.