An anthology of teacher-student romance: You Are an Angel (きみは天使) by Ichikawa Natsuo Ever-Growing Love (背伸びの恋) by Kawabe Ako Gingerbread and Coffee (ジンジャーブレットとコーヒー) by Ayumi Imo A Teacher-Student Battle (先生と生徒の攻防戦) by Koda You Can't Stay Scared Forever (怖がってちゃ始まりませんよ) by Fujita Nagisa Takane no Hana (高嶺の華) by Yumeno Tsubasa Abandoned Love (みすてあい) by D Kissan On the Rooftop (屋上にて) by Goumoto Prank ~Shiota-sensei to Amai-chan~(イタズラ~塩田先生と雨井ちゃん~) by Nakatoka Kumiko
The story of an OL and the witch she discovers, now living together. (from MangaUpdates)