The Saint's Magic Power is Omnipotent Manga, Vol. 1

This was cozy and charming. It started a bit slow, info-dumping as the character is introduced to the world she's suddenly found herself in, but it picked up half way through and I'm excited to see what cool things Sei will find herself doing next. All-powerful characters can be a hit or miss for me, but her nerdy personality and circle of pretty boys are holding my interest for now!