Mahiru Kouzuki, a skilled artist, gives up on her passion after her elementary school classmates ridicule her colorful jellyfish mural. Several years later, upon encountering an unexpected admirer in Kano Yamanouchi—a former idol with a troubled past—Mahiru decides to pursue her childhood dreams once more. Tasked with designing the mascot for Kano's new music project, JELEE, Mahiru enlists the help of her childhood friend and professional streamer Kiui Watase to make JELEE's first music video. Together with Kim Anouk Mei Takanashi, a pianist and fan of Kano's work as an idol, the girls aim to turn JELEE into a global hit. However, if they want to succeed in this ambitious endeavor, they will first have to free themselves from the shackles of their pasts.

The protagonist of the story, Konoha Inoue, is a seemingly normal senior high 2nd year student. His high school life, other than a hinted incident 2 years ago, can be summed up as normal- if one can dismiss the secret fact that he used to be a female bestselling romance author. Due to that incident, however, he has now vowed never to write again. This continued on until he was forced to join the literary club by the literary club president, the 3rd year female student Amano Tooko, a beautiful girl who has a taste for eating literary works. Now he has been tasked with writing her snack every day after school.

Mylene Hoffman, a beautiful cyborg spy with the codename "009-1" lives in an alternative world where the cold war never ended, continuously on-going for 140 years. The world is split into two factions, the West and the East block. A masquerade of peace between the two is slowly dissipated as the conflict occurs. Through politics, the two factions battle over supremacy over technology to threats of a nuclear attack. Mylene Hoffman, teaming up with three other agent, gets surrounded by deception, chaos and rivalry as she carries out missions assigned by her superiors. [Written by MAL Rewrite]