Romance in a story can bloom in myriad different ways, from a swift and magical love at first sight to a nerve-wracking enemies-to-lovers arc. Yet, some of the sweetest love stories in anime begin as tender friendships, only to gradually develop into something more. Couples who start as friends have added depth and understanding to their relationship, which makes such romances that more engaging and realistic.
Source：https://www.cbr.com/greatest-friends-to-lovers-anime-couples/
