Bokura ga Ita, Koizora: Setsunai Koimonogatari Recommendations
it has d same atmosphere,a plain girl who entered high school,unexpectedly fall for someone they thought they never will,and the pain of being heartbroken and so on.
Yeah, it's really a lot like BGI. Both girls fall in love with a cool popular boy, have a serious relationship, suffer hardships of the reality, and there are a lot of people who don't wish for their happiness.
Although BGI is "lighter" in sense of hardships. Koizora is really tragic. Mika suffers A LOT, starting from rape to miscarriage.. Koizora is a true sad love story.
Both are highschool romances, the timeline is fairly similar (high school through college-ish). I actually find the male leads incredibly similar, especially how they handle breaking off a relationship and putting all the weigh of a situation on themselves. Mika’s story is a little more eventful in terms of what happens during her high school life (more mature content also) but the love that’s thrown around in these stories is the same. Mika and Nanami never stop loving and wanting to be with that one person no matter what.
Both manga have similar feelings, as well as situations. Both of the heroines are baby-faced and a bit childish, but fall in love with a more popular guy and eventually start dating. Throughout the series, there are obstacles from people of their past, their close friends, and even familial or personal health problems.