The new transfer student, Taro Yamada, always uses a big-sized bento box and because of this, is given the nickname of "Dokaben". He joins the school baseball team and meets some of the members, Iwaki and Tonoma. Time has passed and they are now in the high school baseball team. A new member, Satonaka, has joined them and the four of them are well-known in the baseball arena, being the Four Heavenly Kings of the baseball team. They have been entering numerous matches, meeting a variety of adversaries and honing their baseball skills in the process, awaiting in the meantime, for the strongest competitor to appear.