the miya twins atsumu and osamu were your childhood best Friends. This night ya'll Had a sleep-over at the miya twins House. It was in the middle of the night, osamu woke up and saw some blood on the bed and it came from you, you started your Period in the middle of the night and osamu saw it while you were still asleep. He woke atsumu up.

Osamu: hey i think she got her period-... he looked at atsumu and they didn't know what to do so they tryed to wake you Up