海灘排球雙重攻擊交換券
海灘排球雙重攻擊交換券, GMS v271
This coupon grants the Double Water Ball Volley Skill.
Can be used after acquiring Water Ball Volley. Upon using Double Water Ball Volley Coupon after acquiring the Linked Skill 'Water Ball Volley,' 'Water Ball Volley' will be replaced.