All Rumi Yokoi wants to do is focus during school, but she is constantly distracted by Toshinari Seki, her neighboring classmate. Paying attention during class is the least of Seki's worries, as he obsesses over intricate setups created using an assortment of items, from an elaborate domino course on his desk to a treacherous war played out with shogi pieces. Yokoi desperately attempts to focus in class, only to be repeatedly sucked into his intriguing eccentricities; however, they always seem to end up with her getting in trouble with their teacher. Fortunately, lessons will never be dull with Seki's antics around! [Written by MAL Rewrite]

Mahiru Shirota firmly believes that simple is best and troublesome things should be avoided at all costs. It is troublesome to do nothing and regret it later—and this ideology has led the 15-year-old to pick up a stray cat on his way home from school. As he affectionately names the feline Kuro, little does he know that this chance meeting will spark an extraordinary change in his everyday life. One day, Mahiru returns home to find something quite strange: a mysterious young man he has never seen before. His subsequent panic results in the uninvited guest being exposed to sunlight and—much to Mahiru's shock—transforming into Kuro! Upon revealing himself as a mere lazy shut-in vampire, Kuro promises to leave once night falls. However, one disaster after another leads to Mahiru accidentally forming a contract with his new freeloader, dragging him into a life-threatening battle of supernatural servants and bloodthirsty beings that is anything but simple. [Written by MAL Rewrite]

Sena is like any other shy kid starting high school; he's just trying to survive. Constantly bullied, he's accustomed to running away. Surviving high school is about to become a lot more difficult after Hiruma, captain of the school's American football team, witnesses Sena's incredible agility and speed during an escape from some bullies. Hiruma schemes to make Sena the running back of his school team, The Devil Bats, hoping that it will turn around the squad's fortunes from being the laughingstock of Japan's high school leagues, to title contender. To protect his precious star player from rivaling recruiters, he enlists Sena as "team secretary," giving him a visored helmet and the nickname "Eyeshield 21" to hide his identity. The Devilbats will look to make their way to the Christmas Bowl, an annual tournament attended by the best football teams in Japan, with "Eyeshield 21" leading the way. Will they be able to win the Christmas Bowl? Will Sena be able to transform from a timid, undersized freshman to an all-star player? Put on your pads and helmet to find out!

Following the conclusion of the large-scale coalition campaign, the entirety of China is in a state of economic recovery. The victor of the battle, the state of Qin, is no different. There, the political parties led by Ying Zheng and Buwei Lü continue their inner conflict. Having played the role of king in the coalition battle, Zheng has the trust of the people—but Lü is far from out of the fight. In 18 months, he plans to interrupt Zheng's coming-of-age ceremony. Meanwhile, a Zhao army numbering 20,000 troops has set out toward Qin. In the royal court, due to the lack of generals capable of responding to the incoming threat, Lü slyly suggests that Zheng take command. However, Cheng Jiao, Zheng's half-brother, volunteers instead. As they grew to trust each other during the coalition battle, Zheng now accepts Jiao as his replacement. However, the Zhao forces retreat a mere half-day after clashing with Jiao's army. With trouble quickly brewing in the shadows, the internal struggle of Qin is only complicated further. There are only two men Zheng feels he can rely on: Bi, a general who commands 30,000 men; and Xin, the leader of the Fei Xin force.