"Just ignoring her won't do anything.
For some reason, Mikan will go to Mogura pond, no matter what happens."
-Saike Kuzushiro, Take 003: Infinite LoopMogura pond (もぐら池) is an important location in Saike Matashitemo.
Ten years before the start of the manga, Mikan Karatachi and Saike Kuzushiro were five years-old. Playing at the lake, when Mikan was drowning, Saike jumped in to save her, though neither could swim. They then buried a time capsule, writing letters to their fifteen year-old (current) selves.
Mogura pond is also the site of Saike's many battles and loops against Eiji Hizu.