We lay our scene in the fair Dahlia Academy, where two countries, both alike in dignity, come together; the "Black Doggies" of the Eastern Nation of Touwa and "White Cats" of the Principality of West have a longstanding feud. Romio Inuzuka and Juliet Persia, leaders of their respective dorms, seem to be bitter enemies. In reality, however, Romio and Juliet are hopelessly in love, but revealing their relationship would call upon the ire of all their comrades. They hide their love to maintain peace, but a clandestine relationship means they miss out on many of the activities couples get to do. As they grow closer together, Romio and Juliet must come to terms with the fact that keeping their relationship a secret may prove to be impossible. [Written by MAL Rewrite]

When they were little kids laughing and playing together, Izumi Norimoto and Kazusa Onodera were like siblings. But as their bodies matured into middle school, Kazusa began seeing him as something different; unfortunately for her, so did the other girls. Ostracized, Kazusa had no choice but to distance herself from him going into high school. After joining the literature club, however, she finds friends that keep her mind occupied. Known throughout the school for reading aloud sex scenes in literature novels, the club's reputation has kept all teachers from accepting the task of being their adviser. During a discussion about what they would put on their bucket list, one of the girls says one thing: sex. This single word sends ripples throughout the five girls, as the thought of sex begins taking over their daily lives. And, after walking in on Izumi during a very private moment, Kazusa is sent into a spiral of emotion that forces her to face her true feelings for him. Now, with their hearts racing and the literature club facing immediate disbandment, the five girls must work hard to keep both their sanities and their club alive. [Written by MAL Rewrite]

Miyo Sasaki is an energetic high school girl who comes from a broken family consisting of her unconfident father and an overly invested stepmother, whose attempts at connecting with Miyo come across as bothersome. Seeing Kento Hinode as a refuge from all her personal issues, she can't help herself from forcing her unorthodox demonstrations of love onto her crush.

While Miyo is unable to get Kento's attention as herself, she manages to succeed by interacting with him in the form of a white cat, affectionately nicknamed "Tarou" by Kento. But Miyo soon realizes that she can't help Kento with the various problems she overhears in her cat form and is now caught between two tough choices. Will she continue her relationship with him as a cat, or will she reveal her identity and risk what they have, in order to help him as her human self?

[Written by MAL Rewrite]

After discovering that his orphanage was on the brink of closing due to financial stress, Finn, who was living freely on the streets, set out for a casino with the aim of making a fortune. However, nothing could have prepared Finn for the nightmare that was awaiting him. Once there, Finn encountered a car chase and bloody shootout caused by a man's "lucky" card. Finn will eventually learn what the shootout was about. The world order can be controlled by a set of 52 X-Playing cards with the power to bestow different superhuman powers and abilities to the ones that possess them. With these cards, people can access the hidden power of the "buddy" that can be found within themselves. There is a secret group of players called High Card, who have been directly ordered by the king of Fourland to collect the cards that have been scattered throughout the kingdom while moonlighting as employees of the luxury carmaker Pinochle. Scouted to become the group's fifth member, Finn soon joins the players on a dangerous mission to find these cards. "All you need in life are manners, dignity, and the will to bet on your own life." However, Who's Who, the rival car maker obsessed with defeating Pinochle, and the Klondikes, the infamous Mafia family, stand in the way of the gang. A frenzied battle amongst these card-obsessed players, fueled by justice, desire, and revenge, is about to begin! Are you ready? It's Showdown!!