Ariadne no Kanmuri

Lorenzo, heir to the House of Medici, feels suffocated by the daily routine of a path that's already been carved out for him. But then one day, after coming across a girl who seems to be the embodiment of freedom, his ashen days begin to change color...? Set in 15th century Florence, Italy, a coming-of-age drama mixed with vibrant emotions begins!

(Source: Shueisha, translated)