Mahou Tsukai ni Taisetsu na Koto - Natsu no Sora

Synopsis

Suzuki Sora is a cheerful country girl from the small town of Bie. She made a promise to her father, and following this promise applies and is accepted for a magic intership in Tokyo, where she will face the life in a big city. While training to get better with her magic, she meets a mysterious boy also practicing to become a mage. While he can not use magic that well and he seems distant and cold at first, Sora's fate intertwines with his and the two are thrown together, learning a lot of new things about life and each other.

Synopsis & details from MangaUpdates