The Ruins of Luxoria

Crona, on her way to school, accidentally stumbles into a mysterious ruin.
There, she finds a door leading to a world inhabited by dangerous monsters.
However, it seems she cannot escape without collecting items in that world.
Will Crona be able to escape safely and return to her own world?

Rosina is an investigator with a strong sense of justice. While investigating a missing case, she accidentally fall into the Fallen land. In there, Rosina soon discovers the truth behind the missing people. However, the pathway connecting the two worlds will only open under certain conditions. In addition, the brutal creatures of the fallen land begin to gradually surround her. She must fight and survive until the way home opens again.

Once every few decades, the gate to a lost city with untold treasure is opened for a limited time.
Adventurer Ruka has come to the ruins of this city to see what he can see.
But there is a condition: the gate can only be traversed by a young girl.
His quest seemingly over before it begins, Ruka is helped by a mysterious fox spirit.
She lends him the power of a girl… by turning him into one himself!
 

Set in a world floating in the sky, this story follows Tio, a girl who has lost her memories, as she sets out on an adventure with her companions to save a certain person.Their journey leads them toward the realm of the angels.
Along the way, key moments depict the relationship between the protagonist Tio and Rikiru, as well as their interactions with the people of the various towns they visit.

On my way home from school after dark…
You encounter strange things and wander into mysterious ruins.
There were people crawling in the darkness.