Thanks for the scanlation :D
Whatever I was expecting, it was not this.
I am so confused right now: Ena is or was Hasumi, even though she acts really experienced for a cupid and Hasumi was seen alive a few months ago. Not to mention how their personalities don't match up at all; Ena is very no-nonsense, while Hasumi is said to be very sensitive and artsy. Furthermore, reincarnation should have taken a few years at least. Finally, Touma says that Hasumi's injuries weren't serious.
My theory is that Ena prefers to act extremely methodically, going so far as to disguising herself as Hasumi to try to know more about everyone related to her missions.
She mentions that she has worked on Kitano-san's class for a long time, and has definitely been in the school for a while.
My second theory is that Ena is the family name, while Hasumi is the first name. In this case, Hasumi is likely to be a sibling of Ena's; maybe that's why Ena cares so much about this mission and will angrily engage Chiyo in battle. However, This doesn't match up with the cupid name of Koharu, which erases Sakurada Koharu's family name (Sakurada) instead of her first name (Koharu), but I digress.