Spoiler (highlight to view)
Because I noticed that in both A*D and Aruosumente a black stone appears. I don't know what it's called in A*D yet, but in Aruosumente it's called Kenja no Yume [in English Philosopher's Stone] or Aruosumente.
And also, in Aruosumente, some characters like Lante call Legna "Angel"... Angel's Doubt...?
And also, in Aruosumente, some characters like Lante call Legna "Angel"... Angel's Doubt...?
Are they coincidences or something?