Densuke walks into the Eiken Club expecting nothing and finds himself surrounded by impossibly proportioned women in increasingly absurd situations. The show knows exactly what it is: a relentless, unapologetic machine designed to get a reaction, with comedy that lands through sheer commitment to the bit rather than cleverness. The romance subplot with Chiharu exists in a completely different genre than everything around it, which creates a strange tension that somehow makes the whole thing work better than it has any right to.

Densuke Mifune, a plain and unpopular boy, enrolls in high school at the enormous Zashono Academy hoping to blend into the crowd. That plan falls apart when he runs into Chiharu Shinonome, a beautiful, shy and intelligent girl the whole school admires. Kirika Misono sees the encounter and pushes both of them into her mysterious Eiken Club so they can compete in the school's yearly club tournament. Every other member is a busty girl, and many club activities call for bikinis. Densuke only has eyes for Chiharu, but the tournament draws him closer to his clubmates and their bold advances, in a comedy with plenty of ecchi fan service and romance.