ACCA—a national body of the kingdom of Dowa that provides public services to the citizens of the country—was established as part of the peace settlement between the king of Dowa and the 13 states of the country during a revolt. One hundred years later, Dowa is in a period of unprecedented peace, due in part to the ACCA system. However, rumors of a coup d'état start to surface. Jean Otus, the second-in-command of the inspection department of ACCA, is charged with inspecting all 13 state branches. What will he discover as he performs his audit? Intriguing and mysterious, ACCA: 13-ku Kansatsu-ka is a politically-themed mystery that reveals a world of diverse cultures and lifestyles, with intricate connections between its characters, as the truth of the coup d'état slowly unfolds.

Matsutarou Sakaguchi is a giant roughneck man with strength far beyond ordinary people. He never uttered words like work hard, strive, and dream like the typical shounen manga protagonist. However, he is stronger than anyone and peerless in sumo wrestling. His greatest weakness is his own carefree personality. He grows into a full-fledged sumo wrestler. (Source: ANN)

Feelings may come and go, but true love always remains in the heart. Tsumiki Miniwa is in love with her best friend, Io Otonashi. For her, confessing is nearly impossible; but to her friends, they seem to be the perfect match. Cute and petite, Tsumiki comes off more as a friend, and Io's attitude toward her is friendlier than toward others. Despite the constant teasing and obvious hints that his friends have been dropping, Io always seems to miss the signs. Throughout her everyday school life, Tsumiki spends time with her friends and Io. Will she finally muster enough courage to confess her true feelings?

On her first day at Nishi High School, 15-year-old Hiromi Oka is inspired by top player Reika Ochoufujin Ryuuzaki to take up tennis. Shortly after joining the school's tennis club, she encounters Jin Munakata, the club's new coach. Munakata puts everyone under rigorous training that even puts Ochoufujin to shame. Despite the hardships, Hiromi's determination prompts the coach to select her as part of the club's main players. Because of this, Hiromi must endure the peer pressure from her seniors to become an ace tennis player. (Source: ANN)