Shizuku Yakata Goraiten

By chance, Ayako becomes acquainted with a homeless-looking man. However, when she looks closely at the man's face, it turns out that he's extremely beautiful! What's more, he turns out to be a shadowy pharmacist who makes secret medicines at the mysterious shop "Shizukukan"...? "Make me your disciple!"

(Source: J Comic Terrace, translated)