For high‑school pupils such as Shouichi Kamita, college entrance tests and the future loom large. It is also during this stage that a perplexing feeling, troubling people of every age, may begin to occupy the mind—affection.
In his adolescent years, Shouichi encounters three girls he imagines sharing a future with: the perpetually bright Hikari Tsuneki, who mocks him relentlessly yet harbors a gentle side; the competitive gamer Tooru Miyamae, who struggles to converse with others; and Shouichi"s childhood companion Kyouko Touno, an occasionally naïve shōjo‑manga fan. Seiren traces Shouichi"s bonds with these three girls through three distinct arcs, as their emotions evolve from shared curiosity into something more profound. Their stories intertwine, revealing the complexities of growing up and the nature of love.