If you're looking for manga similar to Romantic Killer, you might like these titles.
Kanami is a 1st-year high school student who Lady Luck hasn't shined on in the love department just yet. One night after falling asleep, she is paid a visit by a mysterious figure who leaves her with a most dubious present -- a book of magical tickets that elicit total obedience from the opposite sex for 24 hours. Kanami is naturally skeptical...but will she pass up on this chance to turn her dreary high school existence into a rose-colored one?
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In both stories the main character meets a magical being that gives them the opportunity to improve their love lives.
The story begins within a small bar which Daisuke Akagi runs called "Dice." Maybe it's their names fault, but in this peculiar little shop, part-timer Daisuke Wakaba, Daisuke Touma and men named "Daisuke" work. A bar you by chance drop by... A young playboy, a vegetarian, a cute boy, a lively classmate and a president of a IT-company. Both their ages and personalities are completely different, just for you. Who is your favorite "Daisuke"?
When Ema's father remarried, she gained more than just a stepmother - she also became the stepsister to thirteen brothers! And as if her now massively-sized family isn’t enough to handle, the girl also learns that they’ll be moving in together! Ema’s new brothers are eager to help her feel welcome, but with everyone living together without parental supervision, the arrangement might lead to more than just new friendships...
Hana Shiraboshi might seem like a typical high school girl, but she carries a secret: her mother is the president of the talent agency White Star, and Hana happens to get a nosebleed any time she’s around a potential idol-to-be! One day, Hana is 'scouting' in Central Park when she sees a group of five boys arguing, as a major nosebleed ensues and causes her to faint. To fulfill her dream of becoming a manager, Hana must now find the five boys once more within one month and convince them to become idols... but will she be able to do it?
Four gorgeous guys, one fabulous mansion and one challenge - turn the landlady's niece into a perfect lady and live rent free; fail and their rent will triple! Surely this task will be no problem for Ranmaru Mori, Kyouhei Takano, Takenaga Oda and Yuki Tohyama, who are lauded as the princes of their high school and have girls dropping at their feet daily... right? The boys' dream of rent-free living comes crashing down when they meet Sunako Nakahara, the girl they must transform. Sunako has devoted her life to solitude, preferring the company of anatomy mannequins, horror movies and the darkened seclusion of her bedroom to the presence of the ‘dazzling creatures' that cause her to have violent nosebleeds. Flushing her out into the light might prove to be more than the boys can handle!
Yuzumi Otome is a master gamer and game creator, and has finally landed her dream job in an otome game company. Now, she will do whatever it takes to conquer the industry. But is success worth it? Will it truly bring Yuzumi happiness? Or will she spend her days wallowing in anger and anxiety? What must Yuzumi do to release a successful game?!
Shimana Kameko lives in a home where she feels she doesn’t belong. Her mother is dead, her father has remarried, and her six-month-old baby brother takes up everyone’s attention. Kameko skips school and runs away to a nearby park, where she literally stumbles over a mysterious man in a kimono. The stranger, Fujiwara Taiga, offers Kameko a place to stay—on three conditions. The first condition is that Kameko tell him why she ran away from home. The second is that she fetch the stranger’s lost apartment key (he is locked out!). The third condition is...to have a dream. Kameko meets the conditions, moves in, and begins a journey of romance and self-discovery.
Gyagu Manga Biyori is hyperactive, random, and nonsensical, revolving around various plots and characters throughout the series.
Batsugoro was the owner of a grocery store, Yaobatsu. When he tried to take a balloon hanged caught on the branch for a little child, he fell on to the ground to die. His son, Ataro, succeeded to the store, but Batsugoro was worried about him, and he remained there being a ghost. Ataro managed the shop alone, but soon his follower, Dekoppachi, began to help him. Being surrounded by strange characters such as, Nyarome, Butamatsu, the heart-warming story develops.