The Japanese anime industry can be split up into not just conventional fictional genres like fantasy and comedy, but also demographics, and they sometimes have unexpected overlap. For example, many of the best romance anime series cater to the shojo and josei demographics, with shojo being aimed at younger girls and josei being aimed at adult women. Shojo and josei have the bulk of all good romance anime/manga series, such as Fruits Basket and Wotakoi, but shonen has an impressive library of romance series as well.
Source：https://www.cbr.com/10-most-romantic-shonen-anime-ranked/
