Ginga Hyouryuu Vifam: Kieta 12-nin

銀河ぎんが漂流ひょーりゅーバイファム 消えきえた12人にん

This episode is a sidestory and can be inserted somewhere between episodes #18 and #21. This is a "mystery" and so the present writer does not tell the whole story. The Janus is sailing towards Taut when something unexpected happens.