Souichirou, who is always referred to by his surname (as per Japanese standard), is the guardian of Lucia, who loves her as if he were her real father. Before Lucia was born, Nahashi was studying to become a mage, along with Lucia&#039;s mother Lilith and Lucia&#039;s father Lucif. He harbored an unrequited love for Lilith, but never got close with her as she was in love with Lucif.   (wikipedia)

After a lifetime of seeing ghosts, young Sumire is recruited by powerful Lucia to fight demons! The girls battle darkness as members of the Venus Vanguard, a group dedicated to ridding the world of its greatest threat—Virus. As they discover why every life is worth saving, they also learn their own unlocked potential for evil. (Source: Crunchyroll)

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"Welcome to Venus Vangard. We've been expecting you." 
Sumire Takahana is a seemingly normal school girl cursed with the ability to see malevolent ghosts known as "Viruses." Her life hits a crossroads after a run-in with a "gothic lolita" clad monster killer for hire, Lucia Nahashia. Not content to stay on the sidelines while these "Viruses" prey on the weak, Sumire decides to join forces with the mysterious eyepatch-wearing Lucia to hunt down these "Viruses" before they can hurt anyone else.
 
(Source: Seven Seas Entertainment)

Souichirou Nahashi