If you're looking for manga similar to Itsuwari Triangle, you might like these titles.
Yuuma works and lives at the amuesment park called "Dream Park". His days are normally filled up with kids tackling him and chatting with coworkers. Well, this is until his new coworker/roommate appears.
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There are semes that have mental disorder called DID (Dissociative identity disorder) in both stories.
Ohno-kun's special skill is "hands-free masturbation"! With his own fantasy, he could ejaculate without touching himself. He spent a fulfilling school life like this. Then the popular guy of their class Kureshima, suddenly became close to him~~~? Getting the girls around them involved in their desire and devices as they go through their youth.
Nanao Shuuji left his hometown where his family runs a well-known chain of supermarkets, and became a part-time teacher at a cram school. One day the son of his father’s mistress, Takatou Kazuomi, appears before him. Shuuji once confronted Kazuomi’s mother, and also injured Kazuomi as well. Kazuomi made use of Shuuji’s weakness in order to keep getting financial aid from his father, and ordered Shuuji to help him, while blackmailing Shuuji with a particular photo…?!
Aki Kitagawa was known to be gay all through middle school, but managed to get out of his surroundings. Since he got into high school, he desperately tried to hide his secret from everyone. However, one of the students at his school, Yoshida Koutarou, discovered his secret and forced him to become a friend with benefits. The relationship began being forced, but Kitagawa started to accept Yoshida…
I, Yuusei Kimura, started jacking off on camera for a gay livestream site for a little extra cash. But, ever since horny lady-killer Shouma from the class next door found out, he's been threatening to tell everyone... "Consecutive orgasms by vibrator." "Live blowjobs." "Anal play." He does all that to me with everyone watching, until finally...!!! As much as I hate him having his way with me, the views and comments are skyrocketing! "If you do exactly what I tell you, I'll hit that spot you like and make you cum nonstop." I can't say no, and Shouma's making more and more hardcore demands every day. Now he's telling me to do "that" at school...!?
13 years ago, Baek Yugeon and his brother were the sole survivors of a mysterious anomaly attack, leaving them “awakened.” While his brother obtained supernatural powers, Yugeon became a “guide,” a being who is able to keep such powers under control through physical touch. When the same anomaly appears again, Yugeon’s brother is left in critical condition with the only one who can save him being Woo Shinje, an S-class awakened and the commander of the hunting order, Erewhon. In exchange, Yugeon must serve as the guide to Shinje’s team, which consists of the withdrawn Joo Taein, the beastly Yoon Chan, and the sadistic Kwon Heesu. Though Shinje seems like the nicest on the team, he might prove to be the most dangerous when he states another condition: Yugeon must follow him into the pit where the very anomaly responsible for all his tragedies awaits…
Atsuki Tajima needs a job to help his family. Following the advice of his friend, he goes to an interview with the president Fujikura, that manages a big company. But the poor Atsuki doesn't know that the director wants to give him a strange job...he has to become his lover!! What will happen between the two men?!
After attempting suicide due to bullying, Katou acquires supernatural powers and an indestructible body. Upon seeing his bully, Oda, again, he murders him with his powers. Katou is exhausted, but Oda comes back to life and awakens with the ability to hear the inner thoughts of others. Katou, curious about Oda's condition, goes to check on him and finds a weak and frightened Oda, a complete change from his previously arrogant demeanor. When the two come face to face, they realize that they cannot hear each other's thoughts, and only when they are together can they forget everything and become "normal" again. In this hellish world, the only ones who understand them are each other, and they grow dependent on one another as if they were seeking a high...
Three yakuza go through a life normal people cannot even imagine. The strife, the love and the complex relationships unwind as their lives continue on.