From Shoujo Sense:

The seven seconds we fell in love, the fifteen minutes we spent holding hands while going home, and the two weeks we spent together. They're all my lifelong memories. How will this limited time love develop...?

From Summer Rain:
Asuza Akimoto is in love with the student body president Ousuke Kobayashi, but she would never dream of confessing to him. Then, one day, she discovers that he has moved into the house next door to live with his uncle, a novelist. When she is offered a part-time position helping them with housework, she takes the opportunity to get closer. However, not everything will be easy when living next to two handsome young men!