In this world, people are born without a gender.
As Hinase approaches their eighteenth birthday, their life continues to diverge from those of their peers. After Shiori and Ritsu both confess their feelings on the same day, confusion sets in as Hinase begins to see their two childhood best friends in a new light. And now that their body is starting to hint at transformation, Hinase must decide who to give their heart to before it's too late...
What draws the line between friendship and romance?