Hiroto Yuri finds himself grappling with newfound desires and confusing dreams involving sea creatures, all observed by the marine biology enthusiast Ogasawara-kun. Struggling with his own sexual identity, Hiroto is drawn to Ogasawara's authenticity and indifference to societal norms. As his feelings for Ogasawara deepen, Hiroto's dreams take a more explicit turn, leading to unexpected arousal even in the most mundane of places like the aquarium. Caught in a whirlwind of emotions and self-discovery, Hiroto questions the inexplicable changes happening within him.