Responses
Yes I agree 100%
I think mei was really insecure despite the friendly way he acted. Mei kept trying to one up akane. I believe he was probably jealous that Akane could be himself.
(Also Mei only talked about himself with Akane he only ever showed off in front of him)
I feel like kei maybe favoured Akane a little more, and when Akane was rebelling he was probably obsessing over it infront of mei. Mei then gets even more insecure and jealous which leads to him confronting Akane.
Conclusion: Akane is a victim. My poor baby. :(
People here are doubting Keisuke's feelings for Akane... But honestly I doubt his feelings for both Akane and Mei. Like he literally just went along with Akane's wish to replace Mei (he wasn't the one that initiated it, and he didn't want it either at first). So I wonder if he actually just went out with Mei just to satisfy Mei?
He has this vibes that he's a "big brother" to the twins and will go along with whatever they want just to make them happy (basically spoil them), ignoring his own feelings (like how he ignored that he's disturbed by Akane pretending to be Mei and just went along with it in the end). And maybe that's the reason Mei was more concerned about his bf "getting stolen" by Akane more than the fact that Akane is rebelling.