Nanatsuiro Drops

"Hoshigaoka, Maikata City — the town closest to the stars in the world."

An ordinary boy named Masaharu Tsumugi who attends "Seijou Academy" in that town is transformed into a small sheep plushie due to a suspicious drink. He eventually returns to his original form but loses all his memories.
The only one who can help him recover those memories is Sumomo Akihime, a special girl chosen by a mysterious wand...

A bittersweet youth love story.

Source: Amazon JP, translated