Horimiya, Sasaki to Miyano Recommendations
Both center on the relationship between two high schoolers who share a connection they hide from those around them. Both have very realistic, relatable characters/plots, and very like-able protagonists.
While Sasaki is in many ways polar opposites with Miyamura, both have similar journeys when it comes to realizing their feelings. Both stories have colorful supporting cast, although Horimiya expands on side characters much more than Sasaki to Miyano.
They're sweet, they're funny, they're stunning. If you like one, give the other a look.
Both center on the relationship between two high schoolers who hide their connection at first. Both also have very realistic and likable characters and a similar path to realizing this role feelings.