Yotsuba will hold onto it and hit the ball like this. [Rocking back and forth on the floor she eventually is able to tap the journal with her forehead.] Goal!

Ohhh, a spiritual five-bump. That must be what all the grandpas and grandmas in heaven do to say hello. [ohwait Yuri is all dead or whatever right? She never really got the whole yuri/naoi/otonashi afterlife thing in any detail. But it seems to be sort of relevant here. Maybe.] Is that how you said hello to people back home?