Majo wa Mangetsu ni Saku

Koichi Hotaka is a second-year junior high school student who is a bit of a shy. One day, he meets a mysterious girl, Shima, who calls herself the "Witch of Alstroemeria" and is chosen as her "contractor". A fantasy of love and magic set on the night of the full moon!
https://www.cmoa.jp/title/278473/