Beware the siren’s call! His sweetest betrayal awaits those who trust him the most!

Isagi Yoichi is a siren driven by a desperate desire to become human again. But it's not the loss of humanity he mourns! It's the chance to exact revenge on Rin Itoshi, the captain who betrayed him! You are the 1,000th and final soul he needs to kill to reclaim his human form. Will you accept your fate, fall for his irresistible charm, or fight against it? Resisting a siren is harder than you think, especially one as charming as Isagi Yoichi!

i wanted a dark siren au so here it is, enjoy <3