It's mistletoe, Imaizumi. I thought that should be obvious.

[ Okay, so he didn't need to be a shit, but it was so funny sometimes. He sighed and shrugged. The fact they can't move felt like it meant they need to be 'proactive' about the meaning of the strange plant. Imaizumi was not his first choice for a kissing partner, but he wasn't really getting a choice here. ]

It shouldn't be too hard to put together once you realize it's not letting us move away from one another.