The story is set in the not-so-distant future. Five "Black Points" suddenly appeared around the world as portals to parallel worlds. Immediately after, strange creatures began their invasion from these portals. These creatures are the inhabitants of five worlds—the same worlds in different timeframes. In order to ensure their own future timeframe survives, each of the five invasion forces battle to wipe the other future timeframes out. The key is one card-shaped device. (Source: ANN)

Virtual Reality and the arrival of Circlet Technology has changed people's lives. A new competitive electronic sport called Circlet Bout emerges, and schools duel to determine the strongest Circlet Bout Club and player. One day, Yuuka Sasaki gets mistaken for a challenger and battles against Chikage Fujimura, the best player in Japan, tying the intense fight despite her inexperience. These events lead to her passion for the sport, deciding to become a Circlet Bout player. Two years later, Yuuka moves to Tokyo and enrolls in Union School, a place where she can practice and pursue her dream of fighting Chikage again. After her arrival at the Union School, she discovers the club closed. Now her first goal is to help the athletic Miyuki Kasahara and club manager Ayumu Aizawa reopen Union's Circle Bout Club and return it to its former glory.

Romeo is a kindhearted and courageous boy living with his family in a small village in Switzerland. Unfortunately, Romeo becomes the interest of a man named Luini, known as "The God of Death," who is infamous for buying children and selling them as chimney sweeps in Milan. While visiting the village, Luini burns down Romeo's family cornfield in an attempt to have Romeo as his own. With the cornfield gone and his father sustaining a head injury trying to put out the fire, Romeo bravely sells himself to the God of Death in order to help his family afford a doctor. On his way to Milan, Romeo meets a boy named Alfredo Martini and they quickly become friends. Just as Alfredo is sold to a different master, the two boys swear eternal friendship and vow to meet again. As a chimney sweep, Romeo faces many hardships and abuse, especially from his master's family and a gang known as the Wolf Pack. But after reuniting with Alfredo, the two form a fraternity of chimney sweeps called "The Black Brothers," who will learn to fight against the Wolf Pack and help each other in times of need. [Written by MAL Rewrite]

Eustachius no Shitamachi Sennyuu Dai Sakusen (Eustachius' Incognito Operation Downtown) To get more information about Myne and her strange background, Head Priest Ferdinand sends two nobles, Eustachius and Eckhard, to investigate everything regarding her life within her hometown. However, things do not go the way they expected. Corinna-sama no Otaku Houmon (Visiting Missus Corinna) Otto's wife, Corinna, takes an interest in the outfit that Myne wore at her baptism. Corinna summons her alongside her mother, Eva, and sister, Turi, wishing to know the procedure in making such sophisticated attire and accessories. Naturally, for Myne, she sees an excellent opportunity for profit.