From crashing his bike to falling in lakes, Seina Yamada just cannot shake the bad luck that follows him. But his fortune begins to change when he is forcibly recruited into the Galaxy Police and ends up capturing the most pirates in the force. Now, Seina is no longer just the unfortunate boy from Earth; he is a man that pirates have come to fear. Despite his reputation, Seina is still the same clumsy guy, but at least he has Amane Kaunaq, a former model, and Kiriko Masaki, his long time friend, to keep him together. With their help, Seina sets out on an adventure in the hopes of becoming a great Galaxy Police Officer.

Ichiro Hanada is a hyperactive little boy who lives with his parents, sister, and grandfather in a rural town. He is always up to some kind of mischief, often teasing his sister or making rude comments to others. Consequently, his mother constantly scolds him, and even the neighbours express disturbance from time to time on how rowdy he can be. One day, after pulling a terrible prank, Ichiro sprints onto the streets as his mother chases him. He steals a nearby bicycle and takes on a dangerous route, eventually being hit by a truck. Miraculously, he survives the crash, requiring nine stitches to the back of his head and balding for the surgery. However, the near-death experience gains him the ability to see ghosts—the last thing he needs in his life. Since Ichiro is the only one who can communicate with them, several ghosts of people who have recently died come to him, seeking help to fulfill their last wishes before achieving enlightenment. Each adventure with a ghost leaves the young and curious boy with a different lesson that gradually makes him wiser.

As a child, Chihaya Ayase had only one dream: to see her elder sister Chitose become Japan's most successful model. However, upon defending her ostracised classmate Arata Wataya from his bully—Chihaya's childhood friend Taichi Mashima—she discovers the world of competitive karuta and soon becomes enamoured with the sport. Based on the Ogura Hundred Poets anthology, this card game where poems are studied requires excellent memory, agility, and a tremendous endurance from the players. Full of hope, Chihaya joins the Shiranami Society together with the newly reconciled Arata and Taichi, embarking on an exciting journey for the title awarded to the top-ranked female player—Queen of Karuta. Since middle school, Chihaya grew distant from a dispassionate Taichi and separated from Arata. However, in order to improve her skills, Chihaya decides to create a karuta club in her high school. With the help of Taichi, another veteran player, and a few spirited newcomers, Chihaya's new-founded Mizusawa Karuta Club aims for victory in the Omi Shrine's national championship.

Chihaya Ayase is obsessed with developing her school's competitive karuta club, nursing daunting ambitions like winning the national team championship at the Omi Jingu and becoming the Queen, the best female karuta player in Japan—and in extension, the world. As their second year of high school rolls around, Chihaya and her fellow teammates must recruit new members, train their minds and bodies alike, and battle the formidable opponents that stand in their way to the championship title. Meanwhile, Chihaya's childhood friend, Arata Wataya, the prodigy who introduced her to karuta, rediscovers his lost love for the old card game.