Hãy biến mất đi, xanh lam thẫm.

“Stairway Island," a small island with a population of 2,000, home to the “forsaken." Nanakusa lives peacefully in the midst of the stagnant stability. But after reuniting with Manabe Yuu, a girl who is always genuine and honest regardless of time or place, will his daily life change drastically…?