In his previous life, Ai died in order to save his sweetheart. Hell specially allowed him to become the God of Death in the underworld. Ksitigarbha plucked a blue lotus from the weak water and put it in his hand. If the lotus changed from blue to white, he would have the opportunity to meet his sweetheart again in the next life. He became the most diligent Death in the world. Standing at the crossroads, in order to save the daughter of his sweetheart who lost the blue lotus, Ai had to stop what he was doing to stay in the world!