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sirflimflam I think you have misunderstood. The Yukari girl is Izumi's childhood friend and the one she "confess" to when she encounter Fujishori in high school. So they aren't childhood friends, they are just highschool friends.
Oh well, can't say it was predictable to have a "tragic" backstory for the "villain". It's fairly classic by now to have the third one in a love triangle to have sad story about being a closet lesbian. Izumi remember me more and more of Sayaka in a certain way. Lesbian having a bad experience with a girl in middle school then fall in love at first sight with MC in high school then stay at MC's side because she know MC is not interested. Main difference was that Sayaka was never seen as a bad person when Izumi, prior to this chapter was seen as someone somewhat dangerous.
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Oeconomist I can't see hapiness coming from someone who want to monopolize the other. Izumi is rather too possesive for me to make their relation non toxic. Beside, it's forgot that Fujishori just realise that she love Kurokawa so till this isn't resolved, i don't think the confession will be accepted. The "happiest" outcome is that Fujishiro understand Izumi's feeling but reject them and stay friends with her. i will re-use Sayaka for an example. After Touko reject Sayaka, they still stay friend and hang out like nothing happen and Sayaka accepted she wasn't the one for Touko. I know it's not the same set-up at all but it can go this way and have a somewhat happy ending for Izumi. Fot what it's worth, there is still Kurokawa's friend for Izumi.