echo 'digraph {

"Issei Hyoudou" -> "Koneko Toujou" [taillabel = "In love with"]
"Kuroka" -> "Koneko Toujou" [taillabel = "Younger Sister of"]
"Rias Gremory" -> "Issei Hyoudou" [taillabel = "In love with"]
"Koneko Toujou" -> "Kuroka" [taillabel = "Older sister of"]
}' | dot -Tsvg > output.svg