Stevan arrives in Japan as an exchange student at Izu University with a simple plan: study marine biology and improve his diving skills. What he does not know is that his reputation has arrived before him. In his home country, he is known as “the Cursed Diver,” a walking statistical anomaly whose presence underwater tends to trigger chains of unlikely disasters.
The Grand Blue Diving Club immediately adopts him as their new chaos catalyst. For Iori, Kouhei, Tokita, and Kotobuki, Stevan is an irresistible scientific curiosity: he attracts catastrophe, yet somehow always causes miraculous outcomes no one can explain.
From brutal drinking duels to catastrophic night dives, absurd ecchi misunderstandings, and the constant insanity of campus life, Stevan becomes—against his own will—a force of pure chaos impacting every event around the club. Meanwhile, Aina desperately tries to coach him into behaving like a normal human being… with limited success.
Stevan does not replace a single original character. Instead, he amplifies the universe, becomes a disruptive anomaly, and evolves into an accidental legend who reshapes iconic comedic situations while preserving the soul of Grand Blue.