Four for the concept, two for the execution, so we land somewhere around three. Tora, nicknamed Noroshi, and Amane are fellow researchers at the same university lab. When Amane invites Noroshi to his uncle's summer home, Noroshi accepts eagerly, but doesn't realize he's going to be spending the weekend with Amane's friends, one of whom -- and Amane won't say which! -- is Amane's ex. Like a weird bastard child of Nishida Higashi's humor and Ima Ichiko's plotting, the concept in theory is very good: it's a mystery story and an unconventional love story both, with Noroshi as the incompetent detective and Amane as the femme fatale. But there are about five subplots (Aiba? The ghostly old man? Amane's ex's tortured past? PRIME NUMBERS??) that aren't resolved or tied in. As a result, you start the manga feeling like you've missed a chapter somewhere, and you end the manga feeling like the last pages of another story got pasted in.
Ametora