From wiki - ran through chatgpt to make it shorter.
May contain spoilers
Ayumu Fujino, a talented elementary school manga artist, enjoys praise for her work until she meets Kyomoto, a reclusive but highly skilled background illustrator. Envious of Kyomoto's talent, Fujino obsessively improves her skills but ultimately quits after failing to surpass her.
Years later, while delivering Kyomoto’s diploma, Fujino learns that Kyomoto admired her work all along. Inspired, she resumes drawing, and together they win a manga contest. They collaborate under the pen name "Kyo Fujino," but after high school, Kyomoto pursues formal art education while Fujino continues solo, achieving fame with Shark Kick. However, Fujino feels unfulfilled without Kyomoto.
||Tragedy strikes when Kyomoto dies in a mass murder at Tohoku University. Grief-stricken, Fujino questions her art’s purpose. A torn yonkoma scrap seemingly alters time, creating a reality where Fujino prevents the attack, saving Kyomoto. Back in her timeline, Fujino discovers Kyomoto’s lifelong support for Shark Kick. Remembering the joy her manga brought Kyomoto, she finds renewed purpose and returns to drawing.||
Made by Tatsuki Fujimoto, the creater of Fire Punch and Chainsaw man, the anime had its release on the 28th of June 2024 and its manga released it July 2021. The anime movie 57 minutes with a 7.8/10* review from imdb and a 100% on rotten tomatoes.