Onsen Pension Boomboom

A small pension in Inawashiro, Fukushima, with eight rooms and a welcome aimed squarely at families, babies and small kids. The bath, filled with natural hot-spring water, is reserved privately for each room's group in turn. You lock the door from inside and soak with your own group. Shampoo, conditioner and body soap are provided. The whole place is set up around children. Guests mention a play area with toy kitchen things, a climbing wall, a big trampoline outside, and plenty of manga for the adults.