Look at this S! Cupid's Prank - Vol. 4 Ch. 35 - What the Hell am I Doing?

[MangaDex]

 

[etriuswimbleton]

FINALLY! we got an answer. so birthmark only works against those who still in menstrual cycle. those not fully developed OR in menopause stage are immune I see. too convenient Rin wont have any problems getting grannies in the mix. BUT WAIT...THERE WAS A GODDAMN GRANNY THO! She got hit by the birthmark and actually fell under the spell. so how the hell? is that woman younger than Katsura? or we never gonna bring that up???

Ohh kay wait....Makoto having that birthmark...it doesnt seem that it was during the time takako covered her eyes...was it during the miso soup thing?