Manga by author Aikawa Saki

From Manga Abyss:Hotaru managed to get in the same high school where Haruna-sensei teaches to see him again! However, on her first day there, she meets a very unpleasant guy who looks just like her beloved sensei...?

After the re-marriage of her mother, Himari went to her former city. but, she'll meet again the boy who traumatized her in primary school...! But the worst thing is what she'll learn after getting back from school...

From Chibi Manga:Saya is an ordinary lethargic female high school student. At karaoke while she was singing enthusiastically a song of her favorite artist, Takase Kazuki, the person himself was watching her!?