Kagome Aina is an ordinary first-year university student with a fragile memory prior to a near-death experience. However, as she enrolls into Taisho University, memories begin to revive as she bumps into a familiar face from her past. Struggling to cope her university's regulations, she meets Katsura Tsubaki who forms a club, Unity 5 alongside two other students. Together, they form a strong bond in friendship and deal with university together.