Gensokyo's Living Alchemist

Yun Shu is an outsider with no knowledge of Gensokyo. With only vague memories and strange non-equivalent alchemy, he was inexplicably involved in the great barrier of Gensokyo. Fortunately, this is a leisurely and peaceful fantasyland with a cup of tea and a bottle of wine, a party all day long. The next development is to kidnap the eldest lady to order the Scarlet Devil Mansion, kidnap Princess Kaguya to capture the Eternal Pavilion, kick the world, punch the Hakurei Shrine, and start a grand struggle for hegemony... Or should I date the half-beast Shirasawa, support the poor miko, go to the banquet with the king of the night, fall in love with the neet girl online, and live in Fantasyland with love everywhere? [It is a slow-paced, heart-warming story about daily love in Gensokyo and the harem]