 If you liked
Bokura ga Ita
|
 ...then you might like
Mairimashita, Senpai
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For some reason, this two mangas give me similar vibe. The romance starts from the girl getting interested in her schoolmate, which eventually turns into love. His feelings are a bit unclear at the begining. The girl doesn't have much love experience but she's facing the love head on. The boy is kind of mysterious. And of course like in (almost) every shoujo manga, we have additional people in love with our main characters.
Both mangas just give you the 'realistic' vibe and show the growth of the characters in the relationship.