井域：喀洛之血
Kalo (Well Domain: Kalo's Blood)
Kalo is a term for a human-vampire hybrid. Within the power structure of the Redimis system, they were treated as food by the rulers; 4 is one of them.
Valentia Resistance (Well Domain: Blood of Kalo)
The Valentia Resistance is set a hundred years after the main storyline. They used wormholes to return to Authian 814, attempting to stop Redimis from launching a later invasion.
Redimis (Well Domain: Blood of Kalo)
Redemis is a continent in the well of the world, held by the vampire class. The industrialization of magic and the struggle for quartz resources affect the war, while people from the future try to stop its invasion of Valentia.
World Well (Well Domain: Blood of Kalo)
The World Well is a massive prehistoric formation, within which the continent of Redimis is located. Here, civilization revived on the ruins, then developed an industrial system centered around magic and resources.
Beep Japan
Beep Japan is credited with the publisher for "Well Domain: Blood of Kalo."
Nimparth
Nimparth credits the developer in Wellfield: Blood of Kalo.
4 (Well Domain: Blood of Kalo)
4 is a human-vampire hybrid, once acting as an assassin. After completing her revenge, she feels weary of violence but doesn't know how to change her life, often using coldness and caution to protect her vulnerable side. Walking with Norma helped her face different possibilities.
Norma (Well Domain: Kalo's Blood)
Norma comes from the Valentia resistance a century later. The war took away her family, and after being injured, she underwent mechanization and regained her original appearance through projections. As a newcomer, she returns to the past, trying to stop the aggression that follows.
Well Domain: Blood of Kalo
"Wellfield: Blood of Kalo" is a fantasy visual novel developed by Nimparth. Living under vampire rule, Half-Blood Girl 4 meets Norma, a member of the resistance from a century later, and becomes involved in an operation to stop future wars.