
If you're looking for manga similar to Osananajimi wo Huttara 180-do Chara ga Zureta (Light Novel), you might like these titles.
You're loved by such an honest girl, doesn't that make you even the slightest bit happy!? That such a flirty Kouhai would follow you around all the time!? Futahara Touka, a childhood friend's younger sister, and a self proclaimed annoying little devil-type kouhai who enrolled in the same highschool. Apparently, she's also a "Self-proclaimed Senpai-worshipping beauty". And that beautiful little devil kouhai yet again came to pick me up early in the morning. "Senpai! Let's hold hands! Warm me up!" Only I, however, know that she's actually the naive, shy type that blushes just from holding hands, and gets extremely flustered inside while teasing me.. The show she puts on as the little-devil-character is just an act in order to get closer to me. And that she doesn't like me-- yet.
At the end of a summer when Hayato was a child, he made a promise to his precious (male) friend. 7 years later, Hayato transferred to a high school in the city and met his childhood friend again, who had become a... neat and pretty girl! Haruki, known as The Takamine Flower of her class, smiles innocently at Hayato with the face of a brat when they are alone, trades lunches in empty classrooms, plays games together at home… But she turns red when he makes fun of her and treats her like a girl. It’s cute. The country and the city, the boy and the girl, the grown-up mind and body. If there are things that have changed while they were apart, there are also feelings and promises that have yet to be changed.
While on his way to school one morning high school second year Ryo Takamori saves his childhood friend Hina Fushimi from a sexual harasser on a crowded train. Although the two are practically opposites in appearance and popularity, not to mention the fact they haven't spoken since middle school, Hina finds herself smitten with the oblivious Ryo.
Yuu Sawatari, a high school boy, is sick after suffering a painful heartbreak. His nextdoor childhood friend, Cocoa Shirayuki, shows up to take care of him. From that day on, the distance between them grows closer... This is a tense, sweet, and slightly heartrending love story of a boy who has lost his love and his childhood friend whose love has long been unrequited.
One day, You Hazakura, who feels that going to school is pointless, witnesses Marin Akimi, one of the two most beautiful girls in school, lose out on her love. The look on Marin’s face as she walks away makes him pause for a moment, but then he follows her to the rooftop to talk with her. From there, You makes a promise to her. After this, the two started hanging out with each other. They started to be together at school. After the people around them heard the words that Marin threw at him, they misunderstood that the two are dating― And for some reason, the winning heroine of this time, Kasumi Nemoto, turns against Marin. Kasumi Nemoto― is a childhood friend of You.