The three part Escape To doujinshi looks interesting. I do t know 100% what is going on because the translation I used is a little messy.
Part 1: From what I was able to make out on the available pictures (not 100%), Kokoro is being harassed by two boys and Mitsuru comes to her aid and reminds her to be careful. Kokoro walls home as it starts raining and is lonely because she wants to be with Mitsuru. She goes to his apartment and he lets her stay but they feel awkward.
Part 2: Kokoro imagines about going on dates with Mitsuru (after they likely spent the night together). However, Mitsuru seems conflicted over something and wants to tell Kokoro but he has trouble. She then hugs him and she says she never wants to let go.
Part 3: Kokoro tells Mitsuru she is pregnant and is talking about her plans with school and they can still be happy but Mitsuru isn’t sure, and Kokoro is sad and tells him of her decision to be a mom and asks what he wants.
The other doujinshi, Missing Ring, by the same author is obviously about MitsuKoko post memory erasure.