 If you liked
MagMell Shinkai Suizokukan
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 ...then you might like
Kanojo to Kare no Kankei: Heibon na Hayakawa-san to Heibon na Miura-kun no Hibon na Kankei
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Although MagMell seems more focused on the educational aspect and Kanojo is a typical high school romance, both are more slice-of-life stories taking place in modern Japan with a typical art style. If you want a peaceful story to take a breather with that you can take a pause on and come back to, neither manga is plot-heavy or an intensive read.