Our summer isn’t over!

Three months have passed since Iori Kitahara began his university life in Izu—
He’s living under one roof with his cute cousin, Chisa Kotegawa, at the “Grand Blue” diving shop where he’s staying. With his older cousin Nanaka Kotegawa, the irresistibly alluring Azusa Hamaoka, and his classmate Aina Yoshiwara also in the picture, he was living the perfect, smooth-sailing campus life!

…At least, that’s one side of the story. The vast majority of his college life is actually a chaotic frenzy with a bunch of naked guys!

That’s because the diving club he joined, “Peek-a-Boo,” only does a bit of diving on the side; its daily routine consists of burly men getting naked and engaging in idiotic, drunken revelry. Iori, along with the handsome yet hardcore otaku Kouhei Imamura, has been completely assimilated into the circle.

In the midst of all this, after finishing his diving license course in Okinawa and returning to Izu, Iori receives a letter from his little sister, Shiori…

His sister’s invasion, the Oumi Women’s University school festival, a test of courage, a date, and a deserted island camp!

Surrounded by his beloved naked bastards, Iori’s university life marches on once more!!