"Sotsugyō M: Oretachi no Carnival" centers on a group of high school students navigating the challenges and emotions of their final year before graduation. The narrative explores their personal struggles, friendships, and aspirations as they prepare to transition into adulthood. The story is set in a typical Japanese high school, where the characters face academic pressures, societal expectations, and the bittersweet reality of parting ways with their peers.

The protagonist, a reserved yet observant student, serves as the lens through which the story unfolds. Surrounding this central figure are classmates with distinct personalities and backgrounds, each grappling with their own dilemmas. One character is a talented athlete torn between pursuing a professional career and fulfilling familial obligations. Another is an aspiring artist struggling to gain recognition while balancing school responsibilities. A third is a charismatic but insecure individual masking their fears about the future with humor and bravado.

As the school year progresses, the group organizes a cultural festival, which becomes a pivotal event symbolizing their shared experiences and growth. The festival, referred to as the "Carnival," serves as a metaphor for the fleeting nature of youth and the importance of cherishing the present. Through collaborative efforts and personal revelations, the characters confront their insecurities, strengthen their bonds, and gain clarity about their paths forward.

The series delves into themes of self-discovery, resilience, and the inevitability of change. It portrays the emotional weight of saying goodbye to familiar routines and relationships while embracing the uncertainty of the future. The narrative balances moments of lighthearted camaraderie with poignant reflections on the passage of time, creating a relatable and heartfelt depiction of adolescence. The characters' journeys are interwoven with subtle humor, heartfelt interactions, and a sense of nostalgia, making the story resonate with audiences familiar with the transitional phase of life it captures.