Ou Qingqing, a pure, lovely, pretty, cold, melancholic, and silly little beauty who calls herself a "goddess" and has only an F-grade water talent, accidentally forms a symbiosis with Chen Jiye, the demon lord of another realm. One is chuunibyou and playful, while the other is stern and fiercely protective; the two go from endless bickering to mutual trust, embarking on a funny and chaotic road to sprint for the martial arts exams. To let her hardworking mother live a good life, Ou Qingqing overcomes laziness under the demon lord's guidance, persists in cultivation, and grows from the bottom of her class to a Tier 2 martial artist. Meanwhile, the maiden's kindness and sincerity also make the demon lord, lonely for nine thousand years, understand what it means to care. Talent cannot define the future; the power of growth comes from hard work and, even more, from protecting one another.