Series by 藤代健

Tsugakawa Emina is a sharp-minded high school girl with a knack for mysteries, enrolling at Tsubamegaoka Private Academy, a prestigious all-girls school known for its vibrant club culture. Due to a school rule limiting new club formations, she teams up with four other freshmen—Mizuno Nana, Naguri Risa, Hatayama Miyu, and Tokorozawa—to create a unique hybrid club that combines their interests in detective work and café life. Together, they tackle small, everyday mysteries, from missing items to school rumors, while bonding over coffee and snacks in their clubroom.

After a heated argument with his father, 14-year-old Ikuto Tōhōin storms out of his home and onto a cruise ship, only for a massive storm to sweep him overboard. Half-drowned and lost, he washes up on the shores of Airantou, a lush, uncharted island with a surprising secret: it's inhabited entirely by women! As the only boy on the island, Ikuto finds himself at the center of attention, navigating the quirks and charms of its lively residents. From the energetic Suzu to the mischievous Ayane, each encounter brings new challenges and unexpected bonds.