Itoshi no Momonga no Kareshi

Synopsis

After helping an unusual kid, Tsukasa’s unrequited love interest Kairi becomes a squirrel. This happens because Tsukasa makes a love request to the mountain god saying, “I want to always be with Kairi”! Now both must stick together and figure out how Kairi can revert back to his human body… (Source: Gentosha Comics, translated)