If you're looking for manga similar to Medaka Box Gaiden: Good Loser Kumagawa (Light Novel), you might like these titles.
"If we continue karuta, we'll definitely meet again." With that promise to the distant Arata in their hearts, Chihaya and Taichi enter middle school. Chihaya tries to find friends to play karuta with her, but her effort is fruitless. Taichi realises his limits at Kaimeisei Middle School, where only prodigies gather, and loses his fervour for karuta. The distance between Chihaya and Taichi slowly grows...
Ikumi and Touma are strangers who are in the same high school class - but because they have the same family name, they quickly are dubbed "husband and wife" by their peers. Through this unlikely introduction, the two become friends. And over the next few years, their relationship continues to grow, thanks in part due to a shared secret between them.
After saying "I wanna go somewhere far away..." in front of Hakase, Yukko and friends are flung into the far reaches of space. They encounter a planet where anything you say becomes real, and enjoy themselves to their hearts' content. But at the same time, Tokisadame City is faced with a fearsome threat?!