Asahi, a girl, falls for Kaoru, a music freak, who happens to be oblivious to girls. At the moment, he has his heart set on buying his dream guitar but isn't old enough to hold a stable job. Asahi agrees to help him buy this guitar because she wants to get closer to him and give him the chance to get to know her. Will he be able to break his sole love for guitar and give Asahi the chance?

Studying at a girl's high school, the main girl character finds herself facing the guy of her dreams each day, and starts going out with him. However, because she's only focused on dating, her marks go down like crazy. Not only that, she just found out that her new boyfriend has an ex-girlfriend to whom she can't even compare.
Aside from the main story, this tankoubon also contains a few one-shots.

While working at the Cafe her parents manage, Saho has fallen into unrequited love with a regular customer there, Kagami. One day, she is determined to make that fateful confession, but!? (Source: Mahou)

From Perfect Illusions:
The story is about a girl who has constantly fighting with an orange-haired boy since the first day of high school. One day she meets Shintaro, her first love. Suddenly the orange-haired boy confesses his love to the girl. Shintaro mistakes them for a couple and thus ruins the girl's chances of expressing her love for Shintaro.
From Perfect Illusions.

Nao Yoshikawa stays behind to live by herself when her parents leave to inherit her grandpa's farm in the country. On the day she moves into her new apartment she soon discovers that it was rented also to Hisashi Uehara - a cute, super-cool and popular guy from her school. Not only did their housing agency unexpectedly close down, the landlord of the apartment tells them that they had to pay more for their apartment then they had expected. With both no money and no home to return to, Nao and Hisashi decide to live together as flatmates. (Source: ANN)
Contains the one-shot: Kare to Kanojo ni Hanataba wo (His and Her Fortune Bouquet) in volume 1
Kazuya is a young model who has always had a crush on Harumi but she couldn't care less! That is until Kazuya losses his memory, does Harumi possibly harbor feelings for Kazuya?

The sequel to Good Morning Call. The series takes place a few years after GMC. Nao and Hisashi are in college and are living in across from each other in an apartment complex. When Nao's father pays a visit and learns of Hisashi he takes Nao back to her family. Hisashi realizes how much he hates being away from her and proposes.

[From Shoujo Magic]:

Takasuka Yue is best known for her work "Good Morning Call" / 『グッドモーニング?コール』 ("Guddo Mooningu Kooru"), but this adorable work should not be overlooked. The heroine and her conflicts are some of the cutest things you'll ever see! Haru, an energetic, honest, and sweet young girl, meets the popular grade schooler Yashima at a bowling rally, and she unintentionally develops a strange interest in him. He's very forward about wanting to date Haru. However, Haru is in love with her childhood friend, Yuusaku, who thinks of Haru like family and rejected her love confession before he left for America one year ago. But now Yuusaku is back! How will both boys respond to learning that they have competition for the role of most important man in Haru's life?