Hi, i'm looking for manga similar to Seven days only that would it be shoujo-ai. Haven't read any yet so give me even the most obvious suggestions ^^ thanks

Girl Friends is one of my most favourite shoujo ai ever. It's a bit on the yuri side as it does have a few nude scenes, but it's not an ecchi or hentai series so don't worry. The focus isn't on that but on the relationship between the girls. It's pretty touching and cute.

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I haven't read that but by the description I'd recommend Candy (Suzuki Yufuko). It consists of a popular kouhai who does archery and the upperclassman that confesses to her.