DOT code for this series:
digraph 23233 {
1 [label="Shinmai Maou no Testament"]
2 [label="Shinmai Maou no Testament OVA"]
2 -> 1 [label="Prequel"]
3 [label="Shinmai Maou no Testament Burst"]
3 -> 2 [label="Prequel"]
4 [label="Shinmai Maou no Testament Departures"]
4 -> 3 [label="Prequel"]
3 -> 4 [label="Sequel"]
5 [label="Shinmai Maou no Testament Burst OVA"]
3 -> 5 [label="Special"]
6 [label="Shinmai Maou no Testament Burst Specials"]
3 -> 6 [label="Special"]
2 -> 3 [label="Sequel"]
1 -> 2 [label="Sequel"]
7 [label="Shinmai Maou no Testament Specials"]
7 -> 1 [label="Other"]
1 -> 7 [label="Other"]
}

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TODO: Directly put a picture here. Preferably with clickable titles.