Previously, I used things of Midora.
It seems that if the cap side faces upwards, ink will go down, so ink does not come out when you want to write. It seems that you can use it without problems if putting the cap side down. However, when putting it in a pocket, it is a situation where you do not know what color the cap is below. I thought that it would be good if there was a color display on the pen's butt as well.