Fifth grader Koh Kitamura - the son of a sports shop owner and often delivers the goods Tsukishima family that kept the neighborhood cafe "Clover" and baseball simulators. Family business partners are very close, because Ko Kitamura and Tsukishima four sisters - Itiё, Wakaba, Aoba, and Momiji - consider themselves almost relatives. Of Contemporary Co -Wakaba and Aoba - funny and athletic girls, and Wakaba prefers swimming and Aoba - baseball. By itself constantly exercising at the gym and has become a great batter, however, in the other components of baseball was a little weak. Wakaba and Ko were born on the same day, and all consider them a great couple, the woman in this absolutely surebut to no objection, it is wise considering that before the wedding, it is necessary to survive. Alas, the words were prophetic. The family suffered a terrible misfortune - Wakaba died. But having gone through the mountain, her friends and relatives to move on, and the series will describe the life and relationships of the main characters throughout middle and high school. What will happen with Ko and Aoboy - whether their baseball brought together,or forever divide shadow sisters? Will old friends resist the invasion of "Vikings" from which an ambitious coach decided to create a "dummy" superkomanda school? Performed Itiё and Aoba two very interesting promises? Answers will "cross game", which involves all the characters!