Ichido dake demo, Koukai Shitemasu.
I Can't Believe I Slept With You!

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Both are uncannily similar. They both start with, essentially, blackmail, but never take the hard turn that you would expect from a title about blackmail. So both series, miraculously, stay light and fluffy. The blackmailer in both have identical reasons for doing what they are doing and the one being blackmailed in both only put up mild resistance and quickly start to question if they actually have feelings for the blackmailer. Both series also feature a side story of unrequited love and regret. Where they differ is Ichido is R rated while Lonely Girl is very PG. That being said the blackmail is actually heavier in Lonely Girl than in Ichido as the blackmailer in Ichido feels remorse for her actions and eases off while the blackmailer in Lonely Girl is happy to be close to the girl being blackmailed and leans into it. read more 

Both are about two adults living together. One is a lesbian, the other is straight. The straight girl eventually falls for the lesbian. This makes their plot similar. 

The way they approach each other are pretty similar,. They both (main character) was too shy to approach the heroine, times goes by and they are now pretty open about it. 

If you’re looking for a moe heartwarming Yuri then this is for you. It is not containing the big plot as Bloom Into You but it is a really enjoyable ride. 

The story of a naïve and kind 'plain girl' main character and her horny neighbour who falls for her and repeatedly sexually takes advantage of her (who tolerates everything) until she reciprocates her love. Yes, I swear there's a genuinely cute and comedic love story (with a dollop of drama) underneath this ridiculous noncon premise, and if you liked one, you're probably going to like the other. 

2 women bound by a contract causing them to live together where one is very much in love with the other and the other slowly discovers that she actually loves her back. Both are pure fluff pieces with little drama to speak of. Ichido dake demo, Koukai Shitemasu. is definitely the stronger of the 2 as it features a character slowly exploring their sexuality rather than just simply trying to decide if she actually loves her or not. 

Girl Friends and Ichido dake follow the story of emotional maturity, romance and seduction between the eyes of odd and awkward main characters. They handled their stories through a cute and detailed style, on one hand Girl friends follows a shoujo direction while Ichido Dake moe. However this doesn't prevents them of showing nudity and sexual scenes, handled in a respectful and somewhat solemn way. If it is for the attractive art-style, the main pair chemistry or moderate sexual scenes, both series will accomplish it with a coherent narrative and smart panel compositions. 

The are similarities in the relationship between the two main characters, both girls, one more or less straight and kinda "sub".