After a chaotic heist, Lupin and Jigen find themselves becoming caretakers of a baby boy, while a young sky pirate called Yutika is after their loot. Yutika is an inhabitant of the city-state of Shahalta, which has recently fallen to a shady minister. Soon, Lupin's gang and Yutika join forces to uncover one of Shahalta's greatest treasures, facing off against both Shahaltan authorities and Zenigata.

Yamada and Notani meet for the first time at an arcade game booth outside a candy store. Shy Yamada is 19, living alone and beset with unspoken tragedy. She doesn't work or study, and confesses to suffering from anxiety. Notani, an older, self-proclaimed ‘traveler', bursts with unrestrained extroversion. She immediately assumes herself as Yamada's new partner, and roommate. They become inseparable, with Notani lugging Yamada to unintended adventures, some rather grim. Meanwhile, Notani's pessimistic views on dying and death.

Awaiting new club leader Kumiko is the Ensemble Contest, and the school's preliminary competition to determine the representative team to participate. Kumiko tries her best to make it to the preliminaries without incident, but the concert band club is so large that there seems to be no end to the problems. And as club leader, she finds herself busy consulting on all sorts of matters. While the other members are deciding on their teams, Kumiko herself hasn't even decided which she will join...

Kitauji High School Brass Band 5th Anniversary Concert

Yuta Hibiki finds himself drawing Gridman, who he seems to have missing memories of. Now in his second year at Tsutsujidai High School, Yuta decides it's time to confess his feelings for Rikka. But their peaceful days would come to a end as Gridman suddenly returns with a warning: "The balance of this world is collapsing."

In their last year of high school, two girls in the brass band club perform a song inspired by a fairy tale that parallels their friendship.

The next piece begins! Kumiko is now in her second year at Kitauji High School, and with a new year comes new problems. As if making it to Nationals wasn't hard enough, Kumiko is tasked with mentoring the concert band's troublesome first years – each with their own distinct personality and problems to solve. With Kumiko busy juggling both the concert band and her new role as senpai, how does her relationship with Shuuichi fit into the picture?