Spinning Maiden and the Taishou Moon

Vol.1 Chapter 3: 14th April 1921
Vol.1 Chapter 2: 13th April 1921
Vol.1 Chapter 4: 21st April 1921
Vol.1 Chapter 2: 13th April 1921
Vol.1 Chapter 4: 21st April 1921
A Reiwa girl transferred into a women's school in Taishou!? Falling unconscious after an earthquake, when opening her eyes, Tsumugu astonishingly found her time traveling to Ginza in the year of Taishou 10(1921). Having nowhere to go, Tsumugu was helped by Itsuki, a duke's daughter, and she was suggested to transfer into Itsuki's school. How would Tsumugu's life become in a different timeline?