Zutto Mae kara Suki deshita. Kokuhaku Jikkou Iinkai

Both are something like a Kokuhaku Series. lol. Confessions everywhere and high school students dealing with relationships. 

These two had same young lover concept of their problematic love life stories. Even their separated story for telling every character story really related at one and another. Just watch with yourself and feel the way their feeling through these two different set of show. 1 with movies concept, and another with only 12 episodes TV series length. Enjoy them. Nb: these recommendations contain to continuations toward their respective sequel or others. Just careful and learn first.  

A group of highschoolers dealing with their innocent love story, that's the main story of these two anime. One of the most visible difference is, one focuses more on the drama, whereas the other one focuses more on the comedy.  

It is a follow up to this one. 

Similarities: High school setting Another part of the show 

Contains a premise of a young girl who cannot be vocal with her feelings yet still tries to do her best to confess towards the person she likes. I find both similar due to them having similar settings, atmosphere, and character dynamics. I recommend these to anyone who enjoys watching fast-faced animated romantic movies. 

Similarities: High school setting High school romance Shy teenagers who want to experience the sweetness and bitterness of first love Same levels of comedy Same levels of romance 

Similarities: Both shows have a beautiful story plot of high school romance High school setting Both are very fun to watch where the comedy level is high 

Similarities: A very similar love story where the MC confesses their feelings to the person they like High school setting High school romance Experience of first love Go through challenges but ends up with a happy ending