First of all you start with Sekai a guy with only one piece of boxers that looks like a mature Sakurai Tomoki(Sora no Otoshimono) and later harasses the girl named Ritori which is VERY OPPOSITE to Ikaros(Sora no Otoshimono)...They are opposite because Ritori gets harassed by the main character but Ikaros isn't, Ritori can laugh and smile while Ikaros can't...the story goes on they hunt for UMA(unidentified mysterious animal) and they meet a girl named Phalem that looks like Nymph(Sora no Otoshimono) and his brother that looks like Sugata(Sora no Otoshimono) and they took down many kinds of UMA. Later Ritori had over-worked so she collapsed in the chapter where they encounter an UMA that eats their ship...moving on the final chapter...it kindda is NOT a happy endinng since Ritori decides to go with her brother leaving Sekai with a kiss and poof!...later Sekai wakes up from a dream and decides to find Ritori with the help of Phalem and the other guys...to put it short Ritori decided to go with her brother...MIGHT be because of this words..."BLOOD IS THICKER THAN WATER" is all I can say about her actions oh well its a good manga beware to those who will read my tip is read one chapter per week or per month because its to short for thse who decide to read it in one day BEWARE the side effects: you MIGHT have a sleepless night this ends my review.