Yamada, Yugi

Aida, Saki

Izumi is a dedicated single parent haunted by his past while trying hard to make a future for him and his son. First suffering the crippling loss of his closest friend after their junior high graduation in what was an ego destroying personal rejection of their friendship, he then went on to lose his young wife due to complications of childbirth. Thankfully, his seemingly tough yakuza brother in law, Sawaragi, was there to lend a hand when he needed it most. Things seem to be going swimmingly well until his childhood friend makes a sudden reappearance, throwing Izumi into emotional turmoil. Just what is Takatsudo playing at, wanting to hang out like close friends again after all this time? Izumi's determined to find out just what is going on before his heart is crushed beyond repair this time...

(Source: DMG)

Taka ga Koi Daro

It's Only Love

たかが恋だろ

Motoni, Modoru

A story about two men that have been best friends for years, knowing the fact that they have feelings for each other, and ignoring it. They discovered it on their college days and settled the matter with a time limit; if they hold the same desire years later they will do something about it. Now both of them have girlfriends, but it seems that their desires only grew stronger, in spite of loving their women. So, what happens when their girlfriends agree to make them indulge in their desires?, and have a relationship only between the limits that desire allows them...

This is a bet, to know what is stronger, love or desire?

(Source: Queen2408)

Koi ga Bokura wo Yurusu Hani

恋が僕らを許す範囲

Takagi, Ryo

A spin-off oneshot of Ousama Game, involving, yet another Prince (5th) ... and, of course, a Pirate... 
(Source: DokiDoki)

Kaizoku Game

A collection of one-shots with continuation from Dare ga Omae wo Suki dato Itta.

1. Shinuhodo Suki
2. Suki sugide Kirai (continuation of "Shinuhodo Suki")
3. 10 jyuu Nen Omedetou Manga

4. Akegarasu
A story of the awkward beginnings of an intimate relationship between the boss of a large business, Yoshimura, and a young and handsome male employee called Sakura. Through this brief oneshot, they discover each other's true personality and find out that they are no so different from one another. (Source: MangaUpdates)

5. Yume no Awayuki (continuation of "Akegarasu")
6. Aokute Gomen
7. Onna ni Shika Wakaranai
8. Ai ga Doushita

Shinuhodo Suki

I Love You All Over the World

死ぬほど好き

Kodaka, Kazuma

A look into some of Nobunga and Sagara's time together.

Mezase Hero! dj - A Man of Many Requests

A Man of Many Requests

Sawauchi, Sachiyo

Devil x Devil Doujinshi

Junior high student Izumiya is surprised by a sudden kiss from his handsome classmate Hayakawa. Leaving him completely confused, Hayakawa suddenly leaves town, but the two reunite again in high school. As the two continue to part and reunite, Izumiya's feelings start to stir...
 
(Source: MU)

Doushite Namida ga Derunokana

どうして涙が出るのかな

Takazawa, Taeko

Chapter One:
Takaya, a high school student, has a relationship with his teacher, Hikaru. As far as Takaya knows, they're still going strong. But then he sees Hikaru with a woman ... ?!

Chapter Two:
This second chapter is about Hikaru's younger brother, Sora. He leaves home after a fight with his father, and wanders the street. He's so hungry after a while, he collides with Keiichi, who takes him home ...

Chapter Three:

Chapter Four:

Love Masshigura!

ラブまっしぐら！

Yamane, Ayano

The grandson of a commissioner absconds and force a police officer to take him in.

(Source: MU)

Cat & Master Dog

キャット　アンド　マスタードッグ

COGA, Mayumi

A collection of 11 oneshots from Coga Mayumi, including Hibi Kira Kira: 

It’s summer holidays for Tomoaki and he is helping out at the daily morning exercise for kids. But recently, he notices that a young man living beside the park has been looking at the exercise group every morning. Is the young man a Lolicon that is targeting his kids, or is it entirely something else? 

(Source: Echochi)

Blind of Mind

ブラインド オブ マインド

Hiiro, Reiichi

Ayase kai almost drowns in the ocean but is saved by a merman. He thought it is all a bizare dream, until the merman shows up again at his company, this time with legs. He claims to be a rich prince and Ayase's new boss but thats not all, his true goal is to make Ayase his mate!
(from B-U)

Wild Fish

ワイルドフィッシュ

A bored magician, Kei, meets Takanashi who is supposedly a card dealer on the cruise ship he's working on. He truly has no idea what's in store for him when he runs across Takanashi. For starters, how about a game of... strip poker?
(from B-U)

12 Manga Like Childhood Friend Complex