Kumorizora no Picnic de Kimi to Kiss Shitakatta

It was pure coincidence. Nakajo Yumi was looking for a place to move to and came across this old apartment. But there she found someone she never expected: Nagao-senpai, the man she had always admired since high school! And the apartment she was shown to was right next door to his! Yumi, who had always been a shy junior, blurted out, "I want to live here!" without even looking inside. But Yumi, who thought, "I can't let a tiny person like me get in the way of my senior," became so shy she went off in the wrong direction...!? From a complicated, pure love that spirals out of control!? Will the love between the reunited neighbors really come to fruition?!

(Source: Hakusensha, translated)