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So I should do this right after completing Rebecca's route?

Or do I have to do something else to start Tatsumaki's route?

I been trying to find information on how to start tatsumaki's route but kind of stumped, I can only finish until Rebecca then that's it, tried to go to the gym on the first floor of the university, tried to delete all previous versions on my pc, and download the 0.14 ver but it still doesn't work.Though, I still haven't delete the saves I archived in another file since ver 0.10, do I have to delete that too? I kind of afraid of doing that since, when I press on skip to new content, it give me two options "which node remains active" and the choices are Erin and Tatsumaki. I choose Tatsumaki and check the phone, her route already completed???? then I choose Erin and interact with her at the office, they send me to sex scene on the rooftop with Erin, then passed out, and after that, Tatsumaki route completed???? So then how am I suppose to START it? Yeah, really confused, like I want to experience Tatsumaki route but there's no way to do that, and if I delete my save files and lost that chance, I had to play from the start, which gonna take ages to do considering that I had to go through three previous girls. So please, anyone can help me?