Schreient's Friends
Poor Schreient, they don't get a lot of love. I guess people are afraid to hang out with girls that could your ass if they wanted to ^_^. Anyway, here's the people Schreient is close to.
Takatori Masafumi
Masafumi is these girls' reasons for living. He apparently saved all of them from really miserable lives. In return, they are his loyal bodyguards. He refers to them as his 'precious dolls,' and the girls all love him, Tot refers to him as her 'Papa." Pel seems to have an especially close relationship with him (ew Ew EW...Pel should have better taste than him!) They help Masafumi with his experiments, and even after he pretty much betrays them, they still stand by their man.
Esset
Esset is basically Schreient's bosses. While it's a big organiztion, the three old people are at the head of everything. They're even above the Takatori family in the evil-Japanese-power-figures food chain. Since Masafumi is the only one their loyal to, they don't seem have much a relationship with Esset. Infact, you never see the two groups in the same groups together. Actually, Schuldig has to give Schreient their orders from Esset, so I don't even know if they speak.
Schwarz
Wouldn't you want to befriend these guys? Actually Schreient didn't really have interest in doing so, and vice versa. Infact, Schwarz pretty much sees Schreient as a weak imitation of themselves. Still, in the second season they both no longer have the Takatori family as a middle man and work exclusively for Esset. Which means they kind of work together, and when Schreient decides to get their revenge on Weiß, Crawford offers Schwarz's support for them (and Schuldig winks at them *swoon*). So they temporarily get along together...key word being temporarily...
Naoe Nagi
Yeah, yeah, Nagi is part of Schwarz and they're already on the list...but Nagi's special and extra-kawaii, so he gets his very own section! Nagi has a soft spot for Schreient member Tot, and he lets her know by making cheeryblossoms fly for her ^_^. He's very much in love with her, and goes though a lot of trouble to keep her safe. He doesn't care about the rest of Schreient, he only asks Tot to leave the group and join him, but he's probably the only one that's really truthful and loyal to her. To find out more spoiler-filled information on the sweetest couple in Weiß, click here.