DIANOIA

Yuki Yamashita visits Frigg to learn more about its urban legend.
Outside an unfamiliar residence a voice beckons.
She enters without aim or intention.
Yuki meets two young girls, Annelinsey and Tamako, who introduce her
to Erika Fushimi, born of the dream world into this residence.
Yuki is now responsible for this girl.
Can they escape the dream? Or will Yuki join these girls in eternity here...

[From DLsite English]