About

In this world, there exists a contract known as the 'Bond of Love,' where a bond is formed by kissing the location of the heart through the skin. The one who kisses the heart becomes the master, and the one who is kissed becomes the partner. The partner must obediently follow the master's commands. Therefore, if someone is kissed by force, they are compelled to obey that person. Naturally, the same obedience is required in the case of a consensual bond. When the heart is kissed, an invisible 'Chain of Love' wraps around the partner's heart like a binding constraint. It is said that at that moment, the chest tightens with a brief, sharp pang. The Bond of Love is a special contract that comes with a price. The partner's mental and emotional state becomes somewhat unstable; they become prone to jealousy, anxiety, and crying easily. Consequently, the master is required to fully accept and love them as a condition of the bond.