From Vampire Knights:

Touko is a 15-year-old aspiring actress who can be a bit of a liar. But thanks to one lie, she lands herself in the middle of an audition for a TV drama! A producer she meets there, Kyouichi, sees potential talent in her as an actress! She's found what she wants to do in life, but what kind of future awaits her?!

27-year-old Hotaru would rather sleep at home than seek romance, but due to unforeseen circumstances, suddenly she’s living with her boss, Takano. What’s more is that she now has a budding relationship with Makoto, who’s younger than she is. Like a dried fish thrown back into the ocean, can she learn to swim again and rediscover the ways of romance?

A collection of oneshots:

1) ABC
Aki is in her first relationship with Yousuke, but he doesn't seem like such a great guy...

2) Nako's Love Letter
Suki's boyfriend, Tooya, is scary looking and always treats her like his servant. How does he really feel?

3) Snow Upon You, Flowers On My Heart
Yu has been asked to take care of his cousin, Sakura, who hasn't talked since she witnessed a car accident 4 years ago.