"Hanihani" is the fan term for the game "Hani: Operation Sanctuary." This sort of thing is not uncommon; the popular game "Comic Party" is often referred to as "comipa" amongst fans.
I've heard of "COMIcPArty". It's pretty cool that I can click a question mark next to a tag to get information on the significance of that tag. Unfortunately, not all tags are defined. "hanihani" wasn't defined, so I had to ask about it. It feels a little bit off to define tags that I didn't start, but at least it's one more tag defined and out of the way.