If you're looking for manga similar to Kimi ni Happiness, you might like these titles.
Ninako’s friend Daiki throws her for a loop when he expresses romantic interest in her. She cares for him, but can she return his feelings? As she tries to sort out her confusion, Ninako realizes that there are many different facets of love—strange and wonderful sides…
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The stories are remarkably similar in Strobe Edge and Kimi ni Happiness. Both have a girl who falls in love with a boy who's "taken" by another girl in some way. Furthermore, their actions in regards to this situation are practically the exact same. Both manga make the reader think about how the only ones to understand a relationship are the two people involved. They have their differences, too, and Happiness is a lot shorter than SE, but if you enjoyed one you will definitely like the other!
Junior-high school student Rei Hoshino, a fujoshi who does not especially have any interest in the 3D aspect of life, suddenly changes when on a rainy day she takes interest in a high school student named Kei Akai and wants to get into the same high school as him. To that end, she enlists the help of her childhood friend Shōtarō Kamiyu who helps her study for the entrance examination, and diet so as to become a cuter girl. All goes according to plan, until a scheming girl going to the same school named Luna Kurotsuki makes it harder for Rei to get closer to Kei.
The dream of the sharp-tongued and mischievous schoolgirl Mari is to become a housewife by the age of 20. Pretending to be a lady, she is trying to find herself the perfect husband for this purpose. And then the super-popular musician Aoi unexpectedly proposes to her! "Let's me marry you, and you, in return, become my vocalist." A calculating ulcer high school student and a genius musician-dunce: a love comedy about a completely incompatible couple begins!
Nao and Uehara-kun, after living together during middle school, are now an ordinary university couple that are semi-living together. Of course Nao has kept the fact that they're living together, a secret from her parents. But one day, her dad makes a surprise visit to her apartment...!?
Asuka, who lived in Hokkaido with her mother, moves to Tokyo to look for her father she has never even met before. When she gets to his house, he is not there, only his children, who claim they have never met their father either. Asuka decides to stay with her "brother" and "sister" while she looks for their father. Her two "siblings" are living alone and things sorta get complicated when Asuka and her "brother" start to fall for each other...
It's been a month since she entered high school, and Jun has started noticing a particular guy hanging around her classroom. When he suddenly confesses, she's not sure where she even knows him from--or how she feels about him. But come what may, he seems pretty intent on sticking around...
Straightforward Yamada Hirono falls in love with Ogata who gives his all for baseball. As her number of unsuccessful confessions climbs to the double digits, his wish for her to leave him in peace to pursue his sport finally seems to get through to her. Will she really stay away or will she be there to push his back when things get tough?
One is a delinquent-looking pervert and the other is a yandere. This is their daily comedy school life.
Little did Nao Kogure realize back in middle school that when she left an umbrella and a box of bandages in the rain for injured delinquent Taiga Onise that she would meet him again in high school. Nao wants nothing to do with the gruff and frightening Taiga, but he suddenly presents her with a huge bouquet of flowers and asks her to date him—with marriage in mind! Is Taiga really so scary, or is he a sweetheart in disguise?