Natsukawa gets slowly swept into a dangerous S&M relationship with his girlfriend Sakurai.

From Aerandria Scans:
Saeki Fumio is a genius who earned a PhD at the age of fourteen. When she goes back to Japan to announce her invention, a bunny robot endowed with artificial intelligence called Alice, it turns out that someone is trying to steal Alice. With the help of Hikaru, a personal bodyguard that she hired, will Fumio be able to keep Alice safe and sound?

From Shoujo Manga Maniac:
Butterfly is a young geisha in training. She loves and admires her childhood friend, Chinatsu-san. He’s a tattoo artist, and he paints butterflies on her arms and is kind to her. One day she visits Chinatsu and finds a naked woman there. Butterfly is devastated at the thought of her friend with another girl all along. Soon after, a rich foreigner offers to buy Butterfly and take her to live luxuriously in a faraway land with him. She’ll miss life at home, but maybe it will help her forget Chinatsu. But does she really want to?

Also includes:
Memories of You

A demon is said to cause a mysterious disease that causes women to age prematurely. After her mother was killed by the legendary demon, "Silver" begins to journey with "Crow," the man she believes saved her from the demon.

Mr. Sakaki and Ms. Ousaka investigate the case of the serial scribbler!

A collection of stories:

• Ao no Rhapsodia
There's a legend about a lost continent of gold and only one man has successfully made his way through the treacherous waters to that continent. The man entrusted the map to the lost continent to his daughter, Allegra Reese, making her the prime target for every pirate on Edythe Island.

• Beniiro Kyousoukyoku (Crimson Rhapsody)

• Watashi no Suteki na Hito (My Favorite Darling)

• Ou-sama Game (The King's Game)
Nene, a young assassin girl, has orders to kill king Ruu, so she goes undercover as his maid. But things are not always what they seem, and this seemingly stupid king has his own agenda. So the story begins, with Nene on her mission, while the perverted King is out to hit on her.

• Natsu no Requiem (Summer Requiem)

Kirara hunts Kagari the White Wolf, who is believed to have killed villagers, travelers, and her older brother.

Nene, a young assassin girl, has orders to kill the king, so she goes undercover as his maid. But things are not always what they seem, and this seemingly stupid king has his own agenda. So the story begins, with Nene on her mission, while the perverted King is out to hit on her.

The caretaker of the Meisen Dorm has fallen ill. Strapped for cash, it's up to her granddaughter, Kamiya Makoto, to work in her place. But living in a dorm with this prestigious school's "four geniuses" proves to be more than Makoto had expected.

From Aerandria Scans:
The long-lasting war between the Northern and the Southern Kingdoms is unbearable. So the northern Prince Johane and the southern Princess Euda decide to tell everyone they are in love, because their marriage can stop the war. But the truth is they don’t get along at all!

Miyoshi is always competing and losing against his childhood friend, Mamiya, who is good at everything. One day, Mamiya collapses from illness and is hospitalized for several weeks. When he returns to school, it turns out he is genetically female, and has decided to try living his life as a girl now much to Miyoshi's horror.

[Several extras have yet to be scanned.]

Sagara becomes a girl in his third year of middle school, and has to deal with his crush on Kurosawa, a female classmate.

Includes an extra story featuring Mamiya and Miyoshi from Kanojo ni Naru Hi five years later in volume 1.
S no Kaikoroku is the extra chapter in volume 2.