“Then, if we stay together, we’ll be immortal!”
-Yukari Hinata, Yuyushiki, Episode 5
Nearly all high school slice-of-life stories – K-ON!, Yuyushiki, Hidamari Sketch, Azumanga Daioh, even Free! immediately come to mind – pit the looming implications of graduation against the every day life of series participants. High school is a perfect fishbowl setting that allows for exploration in friendship group dynamics while the audience puts on their rose-tinted nostalgia glasses and celebrates their personal youth through a happier framework.
Graduation becomes something often dreaded by in-universe characters, as it will inevitably tear them apart. While they scramble about organizing their future plans, graduation to the viewer becomes the final curtain that closes across the stage, effectively ending the narrative.
As the audience is presumably watching a slice of the characters’ lives, the implication is that life goes on after that series or manga volume, just as their life continued – or will continue – following high school. It is this structure that School-Live! plays with.