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When the fourth lady of the fantasy clan met the king of the blood clan, she was supposed to marry someone else, but because of a few letters, she had secretly promised her heart---- Little did he know that one day he was punished and fell into the mortal world, becoming a high school student. When he met the male protagonist again, he looked like ice on the surface, but in fact he had already captured him in his heart. "Be careful, don't get hurt." "I'm fine, you don't need to worry about me" "I don't know who got scratched while running, but I carried him back to the classroom." "..." Someone blushed... The promise made a hundred years ago to never leave, what will it be like to find your lover and return to heaven a hundred years later... Let's watch the heroine and the hero spread dog food together, retrieve their memories, raise their divine pets together, and tear apart the green tea girl???????