The Abyss. A giant pit filled with gigantic cave system that goes down to extreme unknown depths, filled with wonderful and terrifying treasures and creatures never before seen. Only the bravest of the delvers are able to see what horrors truly lie in wait at the bottom.
People are familiar with the great story of Made in Abyss, following a young orphaned cave raider, a mysterious amnesiac robot, and a tragic narehate. But, what if something went differently? What if one single decision changed these unfortunate childrens' story?

Up on Orth a pair of friends, Fyuo and Kwazan, a newly promoted red and blue whistle start experiencing a few strange things happening to them. Fyuo is having dreams of an unfamiliar figure and Kwazan decides to help him figure out the cause of these nightmares using notes she stole from another delver. But, what they find waiting for them only a few hundred meters down, will change their lives forever.