Sorry but are there more possible routes with tsukasa? because from the comments it seems that there are. I'm having the alleged event in green (so with her seeing the sex scene) but how did it happen? I thought I was following a quote-unquote "good" route but that doesn't seem to be the case. Can you explain me better?
There are three primary flags you have to set in order to see the ‘green’ Tsukasa scene like you are:
1. Chose to see Chinami in the bath during
“The Gap in the Door” way back in Chapter 2.
2. Chose Tsukasa instead of Chinami during the
“Holden Caulfield” event.
3. With the above two flags set in motion, you unlock the prerequisites needed to see Tsukasa’s three character events from 0.38:
“Vow of Silence (Pole Position)”, “Blood & Sunset”, and
“Failsafe”.
Note how the last event is underlined. It’s that event in particular that, if seen, triggers the curious Tsukasa content in this update.
Edit: You also need to have watched Tsubasa's h-scene, which first requires you to have seen Futaba and Molly's lust events. Futaba requires 40 lust and Molly needs 10 lust for you to see them both. Thanks Bingoogus for the reminder on that one.