
If you're looking for manga similar to Kokuu no Tsuki, you might like these titles.
Ninamori Tosa, drawn by mystery, left his sickbed to visit Hokage Island, owned by his friend Izumine Masatsugu. Tosa was later found dead. Now his twin siblings Kisa and Mei make their own trip to the desolate island. Their plan – to have Mei seduce the island’s owner while they both look for clues behind their brother’s death. But a fateful encounter at the island’s mansion prompts a slight change of plan…
Riku is a high school sophomore in the middle of his adolescence at a boarding school. Riku is in the throes of adolescence in his second year at the boarding school. He has a crush on his teacher, Toyama, but he doesn't have enough courage to admit he's gay... Then one day, one of the students suddenly disappears! Riku and his roommate Okajima, a delinquent but trusted leader of the students, and his roommate Otomo, an honor student, are trying to solve the mystery, but...?
Daichi's big sister is getting married, and to a super hot guy named Jun Igawa! When they first meet, Daichi's suspicious; what does this accomplished, rich, attractive guy see in his sister? But Jun seems like such a nice guy, and slowly, Daichi starts to drop his guard... is Jun really everything he seems? Or is he a devil in disguise?
Charisma is a multi-perspective story following several different characters. The central character is Archer, whose childhood was rather messed up due to the influence of his mentally unstable family members. His father Ed is afflicted with bipolar disorder, while older half-brother Murphy is autistic. The story follows Archer as he works with Deano to infiltrate a drug cartel that has a long-standing enmity with his gang. Along the way he meets Ken, who's also infiltrating the cartel (for the police). What follows is a multitude of conflicts between different gangs, members of the same gang, and seemingly random people.
Suwa Jun has a casual, convenient arrangement with Assistant Professor Akishima, enjoying perks both in the classroom and in the bedroom -- at least that's what it was supposed to be. Noticing strange changes in the professor's behavior, Jun cannot help but be drawn in further into the professor's life and a darker romance than either had ever anticipated.
High-school student Nanamura Hikaru has little memory of his deceased father, a famous playboy actor, until his father's suave attorney, Shimogura, contacts him with the promise of a sizable inheritance. The catch? Hikaru has to make contact with his eight half-brothers - the fruit of his father's philandering ways.
Endlessly frustrated by his position as a babysitter for sweet but useless young master Ryouma, Tatsumi vents his stress on Miki, a nail artist who enjoys rough sex. Initially attracted by Miki's resemblance to his young master, Tatsumi becomes confused when it's Miki himself he can't stop thinking about.
With the help of a friendly ghost, Masaki, Ono-sensei can examine his young patient's teeth without much fuss. It seems that only Ono-sensei and children can see Masaki. He brings a calming presence, which is convenient for children at the dentist and for Ono-sensei as well. But is he really a ghost? He doesn't remember much about his past but for some reason, he's very attached to Ono-sensei. So much so that Masaki hangs out around the office and even walks Ono-sensei home. Once they reach the entrance to Ono-sensei's apartment however, Masaki is asked to stay out. Ono-sensei doesn't want Masaki to know that something else haunts him behind closed doors.
A university professor who specializes in figuring out the mentality of crime suspects is asked to help solve cases. He also has a relationship with his assistant.