Working man Yajima Shigeru always finds himself falling for straight guys and has repeated one-night stand to flee from his failing love. This time, his heartbreaking decision led him to kiss his current love who happens to be a married junior from his work place! The train conductor happened to see the drunken Yajima planting a kiss on his junior. After being denied by his junior, he's picked up by the conductor, Mita Yuusuke, who claims that that he fell in love at first sight?!
(Source: Girl's Generation)

At Japan's most popular Host Club comes naturally for Junsuke Aki. In fact, he is the club's top performer (and earner!) and is easily the most popular Host with the female clientele. However, his lover, a former Host named Shinobu Hishiya, has forsaken the wild club lifestyle in favor of his new job as a construction worker. Together, they share wild days and passionate nights, making love whenever, wherever, and however they want. But when jealousy and male pride rear their ugly heads, their blissful, sexy relationship may not be able to handle the strain.
(Source: Be Beautiful)
Included one-shots:
Volume 1: The Evil Worker's Folklore ~ Trial version; Gaten na Aitsu
Volume 2: One Day of a Certain Host
Volume 3: Yukata Hajimemashita

Ryuusei has always admired his hard-working, sex-magnet brother Ichirou. After witnessing brothers Ichirou and Gou in an incestuous embrace, Ryuusei questions his own desire to monopolize Ichirou's affections. Much hilarity and angst ensues as numerous revelations assault their relationship. Will Ryuusei's rebelliousness and jealous acts win out against Ichirou's attempts to over-protect him with lies and obfuscation?

1-3) Gaten na Aitsu
Main story is about a rich boy who is always harassed by his senpai. The guy who lives with his family witness him almost raped by his senpai...

4) Play Boys blues Prequel (P.B.B)
This story takes place after Shinobu quits being a gigolo and before the actual P.B.B series. You do not have to read this before reading the series and vice versa. Shinobu and Jyusuke are still friends even though Shinobu quit being a gigolo. This is their story on how they became so close to each other...in more ways then one. (Summary by Karina)

~~~~~~~~
Note ~

Play Boy Blues, Gaten na aitsu, Kawaige, Stepping Stone, Punch Up! and Otonage. are loosely connected. [CJ]

1) Natsu Koi
Beach cafe worker Ide Mitsu was dumping a female pick-up when they heard a loud face slap. They looked over a beach rock and saw it was his seemingly perfect classmate, Shirohara Takashi, who had his face slapped by a woman.
2) Fuyu Koi
Ide Mitsu struggles to define his three-month relationship with Shinohara Takashi who seems to be holding himself distant. After a night out, Ide soon discovers why...
3) Room Mate
The young student wakes up in the middle of the night and finds himself on top of his senior from school... Prequel of Heaven (chapter 4 of Mayou Otoko)
4) Parasite versus Honey
All the students and teachers are getting antsy over a suspicious character that is hanging around school. Sequel of Who Made Him Such a Man? (chapter 1 of Konna Otoko ni Dare ga Shita)
5) Mujina
Hiromichi spends many a nights outside his future brother-in-law’s place, all in the name of gathering signs of possible infidelity. But he who stalks, is stalked in return...
6) Bull Futatabi 2001
A boy brings his childhood friend to his grandmother's place for a quick getaway. Sequel to Bull to Arukeba... (chapter 1-4).
7) Amamiya-kun ~ 3 Years After
It has been 3 years since his best friend graduated and left the room. (short story on the ghost from chapter 3)
(Source: B-U)

Volume 1:
1-2. Punch Up (act 1-2)
Motoharu is an openly gay, elite architect whose preference is the athletic, pretty boy type. While checking out the well-built construction workers at his favourite hunting ground—the construction site—he found his missing wayward cat Shinobu. A hot-tempered, sarcastic, bratty iron-worker named Kouta insists Shinobu is Nyata his cat. Will Maki be able to tame the vicious pet(s)? (features Misono from Mayou Otoko)
3. Punch Up (act 3)
Kouta feels uneasy after finding out about Motoharu and Shinobu's one night stand.
4. Sweet Train
Junsuke presents Shinobu a trip to Sapporo by train as a belated birthday gift. (features Shinobu and Junsuke from Play Boy Blues)

Volume 2:
1-2. Punch Up (act 4-5)
Motoharu learns a little bit more about Kouta's past from the youth's ex-classmate.
3. Ohki Kouta's Interview
A little interview detailing Kouta's job.
4. Punch Up (act 6)
Kouta runs into his brother's ex-partner and is made to remember his painful past.
5. Honeymoon
Fukazu Yuya is going out with Kouta's brother who is a cross-dresser. This chapter focuses on Kouta's little known complicated past.

Volume 3
1-3 Punch Up (act 7-9)
Kouta and Maki happily living together. Are they? Maki feels insecurity about sudden re-appearance of Kouta's first love, Yuya. While Maki tried to let confused Kouta sort out his feelings, catastrophe strikes...!
4. Maki Motoharu's Consolation

Volume 4
1-3 Punch Up (act 10-12)
15 years old Kouta is fighting to differentiate himself from his 19-year-old self! Will he ever regain his memories? Does he want to?
4. My Motoharu is not like this XXX
Kouta is worried because Motoharu seems to be less perverted than before.
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Separate extras:
'Punch Up Returns 2015' - oneshot from Pink Gold 6
Hontoni atta kowai Punch↑ - from Pink Gold 7

Collection of one shots:
1. Priceless Honey
2. Priceless Honey ~St. Valentine's day Limited Edition~
3. Fine Play
4. Yandere Master
5. Replay
6. Fall in XXX
7. ??
(Source: MU)