Maou Toubatsu Shita Ato, Medachitakunai node Guild Master ni Natta - Vol. 8 Ch. 44

[MangaDex]

 

[popo53414]

where boob scar

 

[blablablub]

Stuck in an everlasting fight with a regenerating foe? Just cast anti-regeneration.

 

[Otherworlder]

where boob scar

Magic.
Seriously, the sudden appearance of the magic circle that healed her is the actual answer that this manga gives, such as it is. To quote Jeff Grub's introduction in Spelljammer's Lorebook of the Void, "The simple answer is 'It's magic.' The more involved answer is, 'It's magic, and it knows it's magic.'"

 

[AMicrowave]

typo on the credits page