I have had some periods like this.. they can be pretty debilitating. And it makes sense the male MC would be confused and scared by the pain, nothing can prepare you for PMS cramps.
This series is definitely going into my top 10, maybe top five, I hope it continues to give! And thank you so much for translating, for a first time manga translation it is very very well done.
Thank you so much translator! I completely forgot about this series and I am incredibly happy to see it return, and with such a heart wrenching bonus chapter :(