From Blissful Sin:

1-2) Scarlet
College student Akio is dating his beautiful classmate, Ryou. Unable to stand the slightest loneliness, Ryou accepts any girl who approaches him. One day, Ryou introduces Akio to a girl he is thinking of marrying which makes Akio decide to completely break it off with Ryou. Instead, a heart wrenching love story takes stage!

3-4) One Night Stand
During the day Harumi is just a normal businessman but when night comes he changes into a different person.

5) My Lover
Keito wonders why he is still in a relationship with the overly depressive Naoki

A collection of stories:

1) Beautiful Days
Asahi was taken under the care of Natsume when he was nine after his mother left him. Natsume has a penchant for taking in abandoned pets, and bringing lovers home as well. Asahi finds his feelings for Natsume growing by day, but his love appears to linger on a one-way street, unanswered.

2) Beautiful Sunday

3-4) Beautiful Life

5) Another Life

6) Kyou Anata ni Wakare wo Tsugemasu
In this tale of broken hearts and deception, three young men are caught in the protagonist's web of revenge. Will the unknowing victims be consumed or is it the weaver of the web who will face the final retribution?
- Blissful Sin

7) Ashita Kimi ni Ai wo Sasayaku
Years after a personal tragedy struck his life, Mei struggles to deal with its implications as an innocent bystander is sucked into his tangled web. Told from Mei's point of view, this story falls some time before the conclusion of its prequel, Kyou Anata ni Wakare wo Tsugemasu.
- Blissful Sin

8) Yesterday We Will Embrace Our Sins
The conclusion to the heartbreaking love tale of deception between Misato, Mei and Satoshi, told from Satoshi's point of view.

From Blissful Sin:

Often seen as silent bystander, the eldest son of the Naruse household is about to embark on his own journey of love. Raita is the epitome of success and incomparably handsome but he’s largely a mystery to those around him. With a bully and a pervert for siblings, what can we expect from the self-confessed virgin?

In the Risou no Koibito series:

V.1 - Risou no Koibito (Ideal Lover)

Riku suffered a traumatizing experience after coming out and has since chosen to avoid love. That is until the super-confident and dominating pretty-boy, Yoshimi, walks into his life. He deliberately targets Riku's weaknesses, but what are his true intentions?

This is a story of discipline, guidance and affection that fills both the heart and body of the handsome and brutish Yoshimi and the naturally timid Riku.

6. Furueru Te no Saki (Before Trembling Hands)
They were friends in high school. Now that they are university students, Kou and Ichi have become a pair of rather dysfunctional lovers. Kou enjoys making Ichi jealous and often keeps him at arm's length. But what will Kou do now that a new kid has captured Ichi's gaze?

- Blissful Sin

V.2 - Risou no Yuuwaku (Temptation of an Ideal)

From Blissful Sin:

Akiyoshi Tooru is the perfect student with glasses. Unfortunately, he’s always been told that he was 'cute' and 'pretty' which forced him to develop an inferiority complex as a young man. The very same Akiyoshi received a confession from a boy of rare beauty, Naruse Fuuta. Of course, Akiyoshi rejected the confession from another man. However, Naruse lost it, underwent a complete change of attitude, and attacked him! Now knowing the fearsome nature of Naruse, what fate awaits the fleeing Akiyoshi?!

From Blissful Sin:

1-4) The Devil Smiles
The second son in a family of beauties, Naruse Shouta, is a world-famous hairstylist and model. He constantly showers affection over Ichii Hisashi, the grim but pure-hearted high school student who lives across the street. Due to his self-imposed "Under 18 is Prohibited" rule, Shouta has been impatiently waiting for Hisashi to grow up. However, none too soon, Hisashi's 18th birthday approaches...

The 'Kawaii Akuma' side-story makes its entrance!

5) Tactics

From Blissful Sin:

Super handsome and charismatic Naruse Fuuta, who harbors feelings for honor student, Akiyoshi Tooru, advances to the same university. However, due to their different majors, they begin seeing less of each other. What happens when Akiyoshi becomes acquainted with Naruse’s old friend, Hiyama Chiaki, and goes along to his mixer party?

From Blissful Sin:

Despite his best efforts, Akiyoshi Tooru has fallen for the very beautiful but sadistic and perverted demon, Naruse Fuuta. Not only do they attend the same university, they’re now living together! Though Akiyoshi has always tried to be careful about their night life, he never expected Naruse to stop touching him altogether, and then all of a sudden, Naruse is in an accident and reverts to his adolescent self!

Chapter 8 was part of the Drama CD Special for Scarlet

Volume title can be translated to "Lovely Demon" or "Lovely Devil"