Toujou Household
Basara Toujou[]
Basara is Mio's cousin and stepbrother. She doesn't want to see him hurt, especially if it's because of her. She developed romantic feelings toward Basara due to the fact that he promised to always protect her, no matter who the enemy may be. Later on, through many conflicts, Basara multiple times put his life in danger to save Mio, resulting in her feelings for him increase, as well as Basara's romantic feelings for her.
Eventually, these feelings would end up exploding both emotionally and sexually by sharing their first time together. From this point on, their need and longing for each other became so great that, before long, Basara would impregnate Mio with their first child. Despite this, they tend to have sex almost daily, with Mio determined to have a second child as soon as possible.
Maria Naruse[]
Maria is Mio's younger half-sister and bodyguard, and she is probably the closest living person to her. Despite that Mio gets mad at Maria for her shenanigans, they love each other as sisters and wouldn't mind sacrificing their lives for each other. They both have feelings for Basara.
Yuki Nonaka[]
They started in a bad relationship due to Yuki believing that Mio is the reason that Basara is getting hurt since he's not the same as he used to be since the incident that happened five years ago, so it's unclear how these two really feel about each other. They both saw each other as rivals for Basara's affection, and they often interrupted each other when one of them is getting too close to him. Despite all this, they're willing to put their personal feelings for each other aside and fight together if it would mean protecting Basara.
Celis Reinhartd[]
Chisato Hasegawa[]
Zest[]
At first, Zest was originally Mio's enemy. But after Zest switched sides, the became allies.