Erika knows the route to school pretty well. She walks it every day, after all. She could do it almost in her sleep, which means it's a good opportunity to get lost in her own thoughts for a while. Something new and unexpected she needs to pay attention to almost never shows up.
Tired as she may be, praise from Shinju still gets a smile out of her. "Thanks, senpai. I learned a lot today."
"You're advancing quickly, Erika-kun. Just make sure to stretch again when you get home, and take the rest of today easy."
They're researching Sailor Mars at the library, though there's not much to go on, as well as trying to find leads about Sailor U (also not much to go on).
They could scout the area around the shrine? Or wait to see if her mother can come up with some names. Erika was told to take it easy for the rest of the day.
They should probably wait, then. As long as they're at the library, they could study for classes?
Everything goes normally – until, as the sun's starting to set, her vision goes suddenly white.
There's a girl sitting in the white expanse, hugging her knees. She's alone.
Somehow, Sailor Moon knows (remembers) who she is – Sailor Jupiter, even though she's wearing the face of the new transfer student.
"I don't know... I was unconscious when he moved me, but... There were a lot of girls. Some of them managed to run away, I hope. He was too busy killing me to chase them."
"Like Ran... So that's why..." She straightens from her crouch as sparkling green light swirls around her.