In a desolate world devoid of life, Keisuke embarks on a solitary journey, yearning for companionship amidst the bleakness. When he encounters a fellow traveler, vibrant hues infuse the monochrome landscape. Together, they seek out a mystical witch rumored to possess all the answers, albeit at a steep cost. As they ponder their inquiries and weigh the consequences, will their newfound partnership withstand the trials ahead?