[From MegKF]:

A talented young Japanese chef deals with working for the father of the only chef who always gets the best of him. But what are they going to do as this rivalry develops into something else?

There are two extra at the end of each volume. Volume 1 extra is called A Man You Can't Resist. Volume 2's is an extra from Boku no Koe, My Changeable Voice.

Kaname Otonashi-the former “Ears of the Police” - has the gift (and curse) of hearing so exceptional that he can sense the screams of the dead. His friend Hide is a former cop whose detective work is perfectly complemented by Kaname's incredible talent. Will the swirl of sound that surrounds Kaname help him solve the city's biggest crimes... or will sonic mayhem finally drive him mad? OTODAMA pits beautiful men against calloused criminals in a battle for the streets! Can an acoustical analysis expert and a penniless P.I. take down a serial murderer before he (or she) orchestrates another killing? In a world consumed by noises, Kaname must find the peace necessary to hear the words of the deceased... and the truth that passes from their lips.
(Source: Jmanga)

Iwaki and Katou had always been at loggerheads, starting from the first day they met. 30-Something Iwaki had always felt insecure about his age. Being in the adult entertainment industry always meant that the younger you were, the hotter you were. 20-Something Katou was no different. Katou – filled with arrogance, good-looks and charm had never been Iwaki’s favorite. However, with his age as his downside, can Iwaki still continue to be in the adult entertainment industry or can he deviate to something more…glamorous, perhaps?

SIDE NOTE: Even though Iwaki is the seme the first time they have sex, he gladly relinquishes that role to Katou from thereon after, and is happy to play the uke most of the time.

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From Be Beautiful:
A lighthearted romantic comedy that lampoons the adult film business, the mainstream media, and the natural vanity of actors while exploring the earliest stages of a brand new relationship.

Tohru, the son of a yakuza boss, is sent into exile on a deserted island for his own protection during a gang feud. Fiery and impetuous, he isn't thrilled to be sidelined when he'd rather be in the fight, and is even less thrilled that Mutsumi, son of the gang's second in command, is going with him. The serious, studious Mutsumi is Tohru's opposite in every way, and it doesn't take long before the sparks between them begin to fly!
(Source: SuBLime)

A passionate amour. The moment my fingertips touched his skin, I fell in love. An all-new love legend between men by Nitta Youkai!!!
(Source: Harudaki)

A lifelong dream of fame and fortune has been the driving force of Wataru Jouchi's entire life. Now, after much self-doubt, he's decided to fulfill his destiny and become a voice actor for anime videos. At first, he is thrilled to discover that his long lost friend, Renji Kazama, is considered a top star in the industry.
(Source: Be Beautiful)

Yoshinaga's genius and his gift for political maneuvering have helped him ascend to the higher spheres of the Ministry of Foreign affairs at an early age. As for Shiraishi, the prestige of his family as well as his dedication to his job has also led him to an early career in diplomacy. Yoshinaga is Shiraishi's future brother-in-law as he is soon to be married to his sister. When the two meet in Thailand, a stunning tale of love unfolds.

[From Obsession]:

This collection of stories explores different types of exclusion and isolation. Ever since his father died saving him, Asano has associated his father's white ashes with purity and cleanliness. Unfortunately, for his dark-complected cousin Izuru, Asano's neurosis prevents them from being close. Will Asano learn to overcome his distaste for things that are not pure white for Izuru's sake? Includes three other stories.

This manga is about a couple of 17 year old guys and is settled in Tokyo’s Shibuya expensive neighborhood. They have been doing everything (including screwing their first women) together eversince middle school, where they became best friends. But Haruhiko cannot stand female company anymore and begins to insult them at the place they are used to going. No need to tell that they take it pretty badly and tend to get a tiny bit furious. Kenichi tries to calm things down though. The fact is that Haruhiko has something bothering himself and he cannot let Kenichi knowing about that… (from Daily Manga)

WHEN A MAN LOVES A MAN series:

1) When a Man Loves a Man (1 Volume)
Story of several guys working in host clubs.
Professional rivalry, mistaken identities, unrequited love, and jealousy test Shinkawa's and Takaaki's friendship on a semi-regular basis. But when Iwaki Kyousuke, Takaaki's old flame and mentor, returns to seduce Shinkawa away to a new host club, will Takaaki be able to persuade Shinkawa to stay, or will his devotion to Iwaki cause him to lose Shinkawa's partnership? (taken from Obsession)

2) Last Waltz (2 Volumes)
At the end of When a Man Loves a Man, Shinkawa had rejected Iwaki's invitation to become the number one host at his new club. But now the rivalry between Schnapps and the Rusty Nail is heating up.

Schnapps has hired a new host, Ishii, who is stealing all the other hosts' clients away. What could his motive be? Is Shinkawa right in suspecting that Ishii is somehow working for Iwaki? But when Shinkawa shares his suspicions with Takaaki, why is he so quick to defend Iwaki? How could he still love the guy that abandoned him to start his own club? How can Shinkawa make Takaaki look at him the way he looks at Iwaki?

3) Nightcap (1 Volume)
Flashback showing how Takaaki and Iwaki met and then why the cruel Iwaki abandoned the kid after let him become bisex.

Sequel to "When A Man Loves A Man". Iwaki has been a gigolo for 8 years. When he meets Kato, a homeless kid sleeping against his car on the streets, his fancy is struck. When he finds that Kato is looking to become a gigolo, he gives him money to help him clean up to get the job, just because he's interested. Will he lose his love for women in exchange for his love for Kato?

4) Irokoi (3 Volumes)
Follows the star-crossed love relationships of four hosts, Takaaki, Iwaki, Shinkawa and Kenzaki. Interesting story and well-developed characters, but you should probably read the preceeding three When a Man Loves a Man series to understand the backstory.

5) U:V (2 Volumes)
The final arc of the series on the four hosts and their relationship. Iwaki introduced his nephew, Ozaki Kazuomi, to both Takaaki and Shinkawa; Takaaki is to train Kazuomi before being passed over to Shinkawa. However, Shinkawa still has doubts about Takaaki's feelings for Iwaki; has Takaaki really put his feelings for Iwaki behind him? What about Kenzaki, who has such love and passion for Shinkawa that he's willing to do anything for him?

An accident happened, emotions and feelings clash... Who will finally end up with who? Read on to find out the epilogue of the host series!