Are there any romantic comics anime that explore LGBTQ+ relationships?

Yes, while historically less common, there's a growing number. *Yuri Camp* is a slice-of-life series with a subtle but heartwarming lesbian romance. *Bloom Into You* is a critically acclaimed yuri anime that explores the complexities of same-sex attraction. *Adachi and Shimamura* is another popular yuri title focusing on a developing relationship. More are emerging as the genre evolves.