Limit
A building's roots will limit the things under and around it.
Picture the roots of a building: metal beams going into the ground. Now imagine trying to build something like a subway under there. It's not good! The building limits what can go under it.
げん
かぎ
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The person who hates these limits more than anyone else is Genji (げん). He wants to be able to tunnel under buildings, sneak in, smooch ladies, and sneak back out. But all the building root limits make that impossible!
Picture Genji tunneling under a building where a cute lady lives. He's trying to get in, but the building roots limit how far he can dig. No! Now how will he steal a secret kiss?!