Passionate music-lover Eripiyo only wants to see her favorite underground pop group, ChamJam, make it to the big stage at Budokan. Because they've enriched her life by their very existence, Eri is willing to dedicate everything she has to see this dream fulfilled—even her health. At their last performance she got a crazy nosebleed. Hey, no one said being a super-fan was easy!

One day, a city suddenly disappears. Takuya, a professional by-the-contract courier and lone wolf, meets Yuki, the only survivor from the city's extinction. The two rely on a message from Yuki's father, who was heard to be missing, and head toward the disappeared city, Lost. However, unexpected obstacles strike before the pair, with the reality especially shocking for Yuki. Before them are the feelings of those left behind, a mysterious group manipulating in the shadows, and unveiling the hidden conspiracy. Takuya and Yuki, who both were initially strangers, would deepen their bond during the journey and unravel the mystery of the Lost city.

Constantly outperformed by the girls' club, the boys' soft tennis club faces disbandment due to their poor skills and lack of positive results. In desperate need of capable players, Toma Shinjou is looking to recruit, but he fails to do so. Enter Maki Katsuragi, a transfer student who demonstrates great reflexes when he catches a stray cat, Instantly capturing Toma's attention. Toma ambitiously asks Maki to join the team but is quickly rejected, as Maki doesn't wish to join any clubs. Toma refuses to back down and ends up persuading Maki - only under the condition that Toma will pay him for his club expenses. As Maki joins the team, he immediately outshine the rest of the team. This gives rise to conflict among the team, Maki challenges his fellow team members to devote themselves to the game they once neglected. This story focuses on the boys' soft tennis club and their discovery of their own capability, while also enduring the darker side of growing up in middle school.