Yowai 5000-nen no Soushoku Dragon, Iwarenaki Jaryuu Nintei

Follows Reiko, a little girl raised from an early age to be the next sacrifice to the "Dragon God", in the hope that the latter will agree to defeat the Demon King. Only, in addition to being particularly fearful, it turns out that the large reptile is above all a vegetarian, and that it refuses to eat the young child! Reiko, determined to save her village threatened by demonic creatures, decides to make life difficult for the Dragon in order to convince him to come to her aid.