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I think I know this one. If it's for getting Asuka to pass her second test attempt then all you need to do is keep sleeping. Eventually, (not sure if it's random or not, but for me it happened one or two Saterdays after the last event) when going to sleep you'll have an odd dream. After that you'll be pulled into the Nexus, it's pretty straightforward from there.

Just Incase your still stuck that eviga  and check nexus is the name I guess just click the bed you see different choices