Youjo Musou: Nakama ni Uragirareta Shoukanshi, Mazoku no Youjo ni Natte "Eirei Shoukan" de Dekiai Slow Life wo Okuru

Lilith, the summoner who accompanied the hero party, was betrayed during the battle with the demons and suffered a serious injury because she refused the invitation of the hero. Helped by her demons, she cannot return to the country in a detour, so she decides to become a demon at the recommendation