The protagonist, Asahina Ren, moved to Tokyo to attend university. As he begins settle into his new life, he unexpectedly reunites with an old acquaintance on campus - his ex-girlfriend, Kawaragi Yuzu, from his time in Hokkaido.

The two had mutually broken up when Ren moved away. Despite their confusion at the accidental reunion, Ren and Yuzu slowly begin to reconnect.

Just as this happens, on Ren's birthday, another ex-girlfriend from his time in Fukuoka, Yabuki Mashiro, appears. Having canceled her studies abroad just to see him, she declares that she'll be staying in Ren's apartment.

Driven by a sense of defiance, Yuzu decides to move in as well, and thus begins their strange three-way cohabitation.

Between university, his part-time job, and his daily life with the two girls, Ren's heart begins to waver as feelings from the past intertwine...