after you revive her and she give you her loyalty, you finally kill the Cindirella. All the girl and you celebrate it, and after the celebration, she calls you because wanted to tell you something

— "well... uh... I... sighs, thanks you, Undead. I can't... I can't put it in words, but... you revive me, even if you wouldn't need, and help me with my personal problems... I just... can't say more than thanks you"