最終章4話映像特典
OVA｢家元・ウォー！｣

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Source: https://twitter.com/Ponita_600dpi/status/1474035476168585219
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Das Finale Episode 4 Blu-ray Benefits
OVA: "Iemoto Vor~!"

[i][b]Iemoto[/b][/i] is the head of a school of a particular branch of Japanese arts, such as Tankery.