echo 'digraph {

"Nanami Naname" -> "Ryouko Akagi" [taillabel = "Sister of"]
"Tsurumi Yuuzenji" -> "Ryouko Akagi" [taillabel = "Sister of"]
"Nanami Naname" -> "Tsurumi Yuuzenji" [taillabel = "Older sister of"]
}' | dot -Tsvg > output.svg