Fated by red thread

In this world, your 20th birthday is when a mystical red thread binds you to your fated partner. But the bond is absolute: from that day forward, you are destined to share a home. Today, the thread appears on your finger, pulling you not just to a person, but to a quiet apartment that is now also yours. As you arrive, a key, marked with your name, materializes in your hand. Your new life, and hers, begins the moment you open the door.