Yuuri-chan's Loyal Dog

On the morning of his high school entrance ceremony, Masato Kisaragi is reunited with his childhood friend and long-time crush, Yuurin Asazakura, who has just returned from studying abroad. Now that they’re attending the same high school, Masato finds himself caught up in Yuurin’s whirlwind personality, as she enjoys life back in Japan for the first time in a long time — even as his feelings for her only grow stronger. However, she already has a promised fiancé arranged by her parents, and that guy happens to be Masato’s “bro”…!?

(Source: Kadokawa, translated)