Yakuza / Police

Ch 1-4) A high school teacher, Ueda Wataru, was rejected by a person he loved back when he was a high school student and has been timid in love ever since. However, he's now fallen in love with his student's father, Ippongi Kazushi, a Yakuza. Although Ueda knows that he shouldn't be, he's fascinated with the good looking Ippongi's sweet words...

Alternate version:
http://mangapark.me/manga/houkago-no-love-call

1-3) Miharu, the “black leopard”, is always picking fights, but he’s actually “being raised” by Yashiki, a sadistic guy with ties to the yakuza. Yashiki can no longer see out of his right eye due to events from his past...

4) A yakuza and a detective, who have known each other since high school, trade sexual favors in exchange for information.

Kurata Izumi's memories of Takatsudo Shin end at middle school graduation when Shin told Izumi he never wants to see him again. Now Izumi is a single father whose son is in love with Shin's nephew. They're forced to interact, but Shin doesn't seem to remember what he said to Izumi. Add Izumi's yakuza brother-in-law Sawaragi into the mix...

Sequel to: Takaga Koidaro

Having been sentenced to 5 years in prison for dealing drugs, yakuza Kyousuke Sawaragi just wants to finish his sentence and start a nice normal life far away from his past. So after parole, when he literally runs into former cellmate Shuuya, he's in no hurry to renew their acquaintance. Fate seems to have other ideas though, having the yakuza and Shuuya repeatedly cross paths with him...

Tanaka Hajime and Harada were leaders of the yakuza group called Yanase. They were wiped out in the conflict between the Yanase group and the Kawa-guchi. The Kawaguchi group thinks that they killed Tanaka Hajime and buried him. Tanaka Hajime was saved by Harada, though he has lost all his memory. Knowing nothing, as Harada asks him if its a lie, Hajime states why would he. Then is when Harada tells Hajime that they are lovers. Is this true?

Jinguuji, who‘s not coming to school, is the most “talented“ in his grade. To get this son of a yakuza to attend lessons, Yuuki, the assistant teacher in charge visits him at home. But when Yuuki gets the attention of Jinguuji, who is with a girl, the latter suddenly gets aroused and forces Yuuki to sleep with him....! Is there a “family secret“ Yuuki‘s not allowed to know hidden in the ferocious eyes of Jinguuji who‘s devouring Yuuki‘s body...

Daiki was bought by the Sasaki Group's Wakagashira Tatsumi, who then left Daiki in charge of his bar, Moderate, in order to discharge the remainder of a large debt from his parents. Daiki wants to protect the one place Tatsumi can find peace and is determined to be Tatsumi's shield if need be, but...

Related Series:
- After Morning Love (Side-Story / Prequel)
- Crossover Love (Sequel)

Sequel to: Before Daylight Love

"This world of mine, as a bartender, and the world Tatsumi lives in will never intertwine."

Daiki Sahara was put in charge of "Moderate", a bar owned by Tatsumi, the wakagashira of the Sakaki group. Trying to ease his worries, Daiki seeks comfort in Tatsumi's arms, but...

S&D Securities -- the 4th Guard gathers professionals who are highly trained in combat. However, a reckless youth appears and is hell-bent on sticking to the intelligence manager, Taki Keiichi. Due to a previous assignment, Taki caught the attention of the yakuza and is now being pursued by this persistent rookie to join. Amused by his earnest request, Taki offers for Yuuki to stay with him under the guise of his personal bodyguard.

http://mangapark.me/manga/yongou-x-keibi-single-mind

While looking for a job, Tora mistakenly applies to work at a male’s brothel. Here he meets Shiro, the most requested male prostitute. At the beginning Tora feels reluctant to work in this environment, but the vulnerable aura that surrounds Shiro makes him stay. Everything goes well at first, but soon enough, feelings, desires and painful secrets complicate their relationship.

Related to: Nights Before Night
http://www.mangago.me/read-manga/nights_before_night/