I don't think the items you get each day for assist points are "random" and even if they are they're probably set to equal thirty if you log in every day regardless. It would be foolish if someone who did log in every day couldn't make the thirty point mark due to bad luck. If you've missed five days, that's rough and I wouldn't think you'd be able to make it to thirty at this point, but it can't hurt to try. I could be wrong in my assertions.

Has anyone ended up with a shuriken yet? I've essentially had ramen, practice doll continually so far.

Thanks, I appreciate it. Maybe it is a flawed system that can really deny players via the RNG even if they log in every day; unlikely but still possible.