I think that is more of a milestone than a tombstone.
...well then,it's time to let yourself go from my back, Marisa.You can go back by yourself from this point, right?...yeah....when should I stop by your house next time?...don't make such face, ...whenever is fine.Koushin
This is a 庚申塔 Koushintou, a stone monument of the Koushin faith.'kay?I'm at home most of the time. So you can come whenever you like it.