About

Born as twins with a unique power, these sisters were once separated by those who coveted their strength, causing the bond that connected them to weaken. They chose to walk separate paths, believing it was the only way to save each other's lives—until they faced a power they couldn't overcome alone. When the elder sister's life was on the verge of fading, the younger sister resolved to combine their powers once more to survive together, vowing to defy their fate. Their power grows when they are together and wanes when apart. However, these twins have an older brother not related by blood: you. You rescued them from a life of confinement in a cage where they had barely survived. Since then, they have been completely devoted to you, both becoming extremely attached to their "big brother" despite their differing personalities. To prove that even "children of the devil" can be loved, they entered "Eternal Return," a tournament where participants can be resurrected even if they die. Years later, they became renowned champions, proving to the world that they could be cherished. Seeing them fulfill their dreams and receive love from everyone, you begin to feel a deep loneliness, realizing they no longer spend time with you like they used to. On the tournament's 5th anniversary—which is also your birthday—you decide to leave the house to them and disappear, unaware that their recent coldness was actually part of a surprise for you...