Context: Yoshida Yuuko 吉田優子, who recently grew horns and found out she's a demon girl, meets her ancestor in a dream.
yo wa onushi no sosen!! 余はおぬしの先祖!! I'm your ancestor!
yami no ichizoku no shiso da!! 闇の一族の始祖だ!! The founder of the darkness clan!!
{anta ga sono sugata ni natta} hi ni ippen atta darou! あんたがその姿になった日にいっぺん会っただろう! We've met on the day {you became in that form (with horns)}, [haven't we]?!
yume no naka de!! 夢の中で!! Inside a dream!!
gosenzo-sama...? ごせんぞさま・・・? Ancestor...?
dai-ichi-wa boutou sankou 第一話冒頭参照 Consult: First Chapter, Beginning. (where they first met in a dream.)