@Kaizeel I mean, all the way in chapter one Tsukasa saved Nasa's life by physically throwing herself in front of a truck and walked away with barely a scratch, alongside many slightly subtler clues in various chapters that she has been alive for a very long time.
@GoggledAnon by my understanding, the most common way to type Japanese uses a standard English keyboard layout that basically gets turned into Japanese characters using auto-correct. Based on that, I suspect the "tp" at the end was supposed to be a typo of "to" which would make the ending become...