After a thrilling night at a club in Shinjuku, Mari finds herself stranded after missing the last train home. But instead of calling it a night, this energetic Jirai-kei girl takes her adventure to the next level at a hotel's pool. Clad in her one-piece black dress, stockings, and leather boots, Mari brings her cute style into the water for the first-ever underwater episode of Ruin Street Style.

She begins by striking elegant poses on an inflatable dolphin, turning the natatorium into her runway. Then, in a stunning display of spontaneity, she fully submerges, embracing the water and her own unapologetic energy. The night becomes a whimsical blend of fashion and fun, with Mari's every move showcasing her unique spirit.

As the first rays of sunlight stream through the glass windows, Mari emerges from the pool, drenched but radiant, ready to catch the morning train home...