(I do not own the image) The well is a powerful object indeed, being able to connect two different timelines that are happening at the same time. After Kagome and Inuyasha finally marry and start building a family they decide to visit Kagome's family using a forgotten shard of the sacred jewel. The downside is their two youngest daughters, Mio and Nozomi, ended up in the wrong time to when before their parents married! They have to get their shard back from Naraku before Kagome and Inuyasha find out they are their children and ruin their existence!