An anthology about girls you would want to hug.

Natsuki Ikaruga is a boy who lost his mother and his leg in an accident some years earlier. He returns disillusioned from a harsh life... more>> in the big city to find his old countryside home half-swallowed by the sea. Left without a family, all he has to his name is the ship and submarine left to him by his oceanologist grandmother and her debts. His only hope to restore the dreams for the future that he has lost is to take up an opportunity presented to him by the suspicious debt collector Catherine. They set sail to search the sunken ruins of his grandmother's laboratory for a treasure rumor says she left there. What they find is not riches or jewels: it is a strange girl lying asleep in a coffin at the bottom of the sea. The robot Atri. <<less

Chiaki is handsome, academically gifted, athletic, and born into a wealthy family with a beautiful sister. Despite his seemingly perfect life, he faces a persistent problem: he's never been lucky in love and struggles to capture the attention of girls. Determined to turn things around in high school, he wakes up one morning to a surprising transformation—he has turned into a girl!... more>>

He is shocked to find out that he has lost the appearance he was so proud of, but when he looks in the mirror, he sees a very cute girl in the reflection. He immediately goes to show it off to his twin sister Kaede, who happens to be very popular with the girls, but there is also something very strange happening to her...

(Source: Kadokawa, translated) <<less