Vash Zwingli, mafia member and adoptive older brother to Lilli Vogel. Vash will do anything to protect sixteen year old Lilli, but will he succeed? Or will Lilli be sucked into the dangerous world of the mafia?

Lovino Vargas, a rude twenty year old living who is part of the Potenza mafia, and falling for his roommate.

Antonio Fernandez Carriedo, a friendly mafia member who has fallen in love with his roommate. Will their secret lives tear them apart?

Alfred "Fuck" Jones, the "hero" of the mafia and the infamous womanizer. Is this just an act to protect his roommate Arthur Kirkland? Or are his loves for real? He may steal many female hearts, but along the way, will he break Arthur's?

Anders Densen, the annoying and clingy mafia member. He may want to protect his lover, Lukas Bondevik, but if the already suspicious Lukas finds out, will their relationship be finished? Or will it end with something more sinister?

Gilbert Beilschimdt, the "awesome" member of the Potenza mafia. Elizaveta Hedevary, the tough tomboy of the Potenza mafia. These two lovers are the perfect example of "opposites attract", but will their differences and contrasting ideas separate them forever?

Ten people, five relationships, two mafias, one goal: to protect and care for their loved ones.