In the 1/2 Series:

V.1 - 1/2 Engage

V.2 - 1/2 Wedding

V.3 - 1/2 Honeymoon

V.4 - 1/2 Ceremony

Marino, a 15 year old girl runs away from home due to an arrange marriage, finds her self in a male dormitory by accident, there she meets... Who will she end up with?

"This love is secret.
Secret to anybody.
However, my heart is trembling.
---Hey, I've become aware of these feelings.
Please don't notice.---"

Rin and Aoi are twin brother and sister and are very close. Aoi is popular in her school's kendo club, while Rin is popular with girls due to his fashion sense. When an old acquaintance on a rival kendo team appears and defeats Aoi-chan, and then shows romantic interest in her, Rin feels strangely jealous! Aoi doesn't understand Rin's behavior, and doesn't realize that Rin knows something about her that she doesn't...

Rise, daughter of a famous actress, bumps into a little boy by accident and loses a lunch box. But when the boy comes to return the lunch box he seems to have forgotten everything about himself. Rise offers the little boy to stay at her place, and the next day the boy is not a little anymore?!

Mitsuki's a high school freshman worried about her looks—or, at least, her "baby face". Until, that is, she enlists a little help from classmate Atsuki and her makeup kit. When Atsuki's finished, the transformation is complete—and breathtaking. It's also when the romantic adventures begin—a roller coaster ride of the heart that young and old are sure to enjoy.
(Source: MU)

Kimi ga Tenshi ni Mieru Toki (When You Look Like An Angel) -
"If you try really hard playing tennis, God will give you angel wings," a boy told Yuuka when she was small. She still plays tennis, believing his words. She finally encounters the boy when she grows up.

Includes two side stories.

Miu is an average high school girl who lives in a fantasy world dreaming about the day she'll find her destined one, just like in the manga stories she reads. What she doesn't know is that her prince might be closer than she thought. One day after getting punished to run around the school, she gets hit by a motorcycle at the school gate, and when she sees its a guy she thinks its her so awaited prince. But later she'll find out a secret about this guy and his twin brother.
(Source: Hidoi~! Translators)

Shiina has 2 secrets. She loves her brother Kiri a lot, and Kiri doesn't know that they are not blood related. She doesn't know what to do, she's been hiding it for a long time, and no one knows she loves him.
(Source: MangaFox)