Itoshi no Ko, Charlotte - Vol. 3 Ch. 24.1

[MangaDex]

 

[SpecialProjectY]

Oh man, that was so sad, the Devil or rather Alcide in his human form has fallen in love with magic ore researcher Liane, but her research took a toll on her body and due to accident on her ship that sunken, died...

Alcide tried to look for her body in the ocean, but couldn't find her, allowing himself to be fall into sorrow.

He continued to progress in his research in making the magic ore to extend human life or bring it back, luckily William found the book...

Thanks for the scanlation!