Try Horimiya
This anime is not very slow paced though instead they start dating early, it focus more on them navigating through their relationship.
It's about a popular girl who secretly runs her whole household, and a quiet school nerd who secretly has piercings and tattoos outside of class. They stumble onto each other's hidden lives and end up falling in love.
But if u like the slow paced stuff i have other recs.
also slide the crunchyroll account, it would be deeply appreciated lol