
If you're looking for manga similar to Onii-chan to Yobanaide, you might like these titles.
First-grader Ryuutarou is so shy he can only communicate in writing. His cousin Kiyonosuke, an elite high schooler, has been tasked with helping him make a friend. Ryuutarou thinks it?s a waste of time, and by working with him, Kiyonosuke winds up growing himself.
The manga centers on Kokoro, a girl who is tired out from being busy every day. She goes to a guesthouse to refresh herself.
After giving a lecture at his hometown, Yonezawashima, the old mathematician Uchida Yutaka wandered to his alma mater, and met Sekiguchi Hajime, a fifth grader who enjoys playing with numbers. He was trying to unravel the world using his own equations. The movement of clouds, the branching of a tree, the veins of a dragonfly, license plate numbers, deciding class representatives.... Hajime wants to explain the unknown world using mathematics. If you read it you will grow to like maths a little. The way you look at the world will change.
One day, Majima, one of everyone's favorite person in class, gets to see a surprising side to Sonoki, the class introvert. Since then, Majima can't help but notice Sonoki and call out to him for no reason, hoping for any kind of reaction... When Sonoki turns red and gets all shy like that, how can Majima not fall in love with him? But when it's time to go up a grade, they're not in the same class anymore...