Infinity Train X Yo-kai Watch Crossover: Family Matters After the events of Yo-kai Watch: Another Watcher Season 2 (by NewComer1), Mika Aichi moves in with her cousin Ken Aichi. Though both kids have mixed feelings about it, and that leads to them boarding the Infinity Train. While on the train, Ken and Mika will have to work together to overcome their problems and get their their numbers down to zero so they can return home.