Tangtang, the little princess of the Demon Realm, carries her small schoolbag to "make trouble" at the Immortal Alliance. Who would have known that all her inner thoughts would be broadcasted, and a baby-voiced rant would expose the dark secrets of the immortal and demonic moguls down to the core! The cold-faced Alliance Leader and the aloof Sword Immortal collectively break their defenses and instantly transform into child-rearers. Her biological father, the Demon Lord, smashes spirit stones wildly just to snatch the child. To compete for the custody of the little ancestor, the immortal and demonic realms go completely crazy, kicking off a hilarious daily life of everyone raising a child!