Here is the step by step guide on how to become dragon of dojima.
Step 1 – Take Cigarette.

STEP 2 – Enter without knocking!

STEP 3 – Beat every scum in Kamurocho!

STEP 4 – Meet Majima-senpai!

STEP 5 – Beat Majima-senpai!

STEP 6 – Sometimes even Dragon must retreat!

STEP 7 – GO TO THE KARAOKE!

STEP 8 – Repeat STEP 4 & 5
STEP 9 – DO THE HUSTLE!
