12 year gap. Younger X Older The romance is very very very subtle you won't even notice it. The romance budding is only hinted at the few last chapters. I won't call this pedophilic because she has never show romantic interest towards ML until the last chapter where it was hinted she may had feelings for ML (he was an adult already)
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Ryoumin 0-nin Start no Henkyou Ryoushusama