Centuries ago, the Chinese zodiac spirits and their deity vowed to remain together forever. Bound by this oath, the possessed members of the Souma family are destined to reunite under any circumstances. However, when these ties restrict their freedom, they become an unwanted burden—a curse. As the clan's head, Akito believes he shares a unique bond with the other Soumas. While he desperately holds onto this delusion, the rest of the family remains isolated and suppressed by the fear of punishment. Tooru Honda, who has grown close to the Soumas, is determined to break the chains that bind them. Her companionship with the family and her friends encourages her to proceed with lifting the curse. Yet, due to confusing revelations, she struggles to find the perseverance to continue her efforts. As time slowly slips away, Tooru faces an uncertain future, hoping to reach the tranquility that may lie beyond all this turmoil.