Determined to assert her independence, Yukino Yukinoshita strives to mend her relationship with her parents by proving herself. As the third-year students near graduation, Iroha Isshiki, the student council president, proposes a graduation prom in partnership with the Volunteer Service Club. Taking on this task willingly, Yukino views it as an opportunity to showcase her self-sufficiency, yet the challenges ahead loom large. In Yahari Ore no Seishun Love Comedy wa Machigatteiru. Kan, the focus shifts to the emotional preparations for the prom, offering a platform for the Volunteer Service Club members to deepen their mutual understanding. Consequently, Hachiman Hikigaya's tumultuous and poignant high school journey reaches its conclusion.