Natsuki Imai

Based on a cell-phone novel that moved 11 million people to tears, "Sky of Love" is a story about a regular girl's three stormy years in high school. While her friends are absorbed about their boyfriends, Mika is clueless about falling in love. She begins receiving phone calls from a boy she doesn't know and is gradually drawn to him. She finally meets him but their happy days soon pass as trouble is brewing on the horizon. (Yahoo! Singapore Movies)

Kasumi is shocked to discover that her older sister's fiance is the man she first fell in love with five years ago in high school. At the time, he was her high school teacher and ultimately quit his job racked with guilt over their relationship. Kasumi was deeply hurt and struggled for a long time to overcome her sadness. Now the two of them must come to terms with their secret past before the ones they care about in the present are hurt. (mydramalist.com)

The story greatly resembles 3 nen B gumi Kinpachi Sensei with some stereotypical characters tacked on. There's the hardheaded father figure, who is a ramen shop chef, his tough school teacher daughter, Motoko, who hates Sakuragi, and an estranged older sister, who dad has disowned. Dad is renting out the estranged sister's old room to Sakuragi. Motoko and Sentaro's colleague, Onodera, has a huge Oedipus complex. (mydramalist.com)

Saeko Machida is a high school girl with a crush on a boy in her class named Yuichi Kimijima. Becoming obsessed with him, she tries to gain his attention and win his affections, but there's no such luck. One day, she meets a strange man at a flea-market who gives her a red liquid, telling her that if she splashes it on Yuichi, her wish will become true. She acquiring the liquid, certain that the liquid will cause Yuuichi to love her. (imdb)