Swapping Onsen Ryokou~ Otonari Fuufu ni Ikasare Makuru Ore to Tsuma~

I have been married to my wife Kiyoka for 5 years. The relationship between us becomes cold and we no longer having sex with each other.
One day, our bitterness reaches its limit, and we finally have a fight. When we are about to come to a conclusion that a divorce is the only way to end our problem, the neighbor and his wife act as arbitrators and make a proposal.
\”Swapping\”
My wife will be held by another man, while I will be holding his wife.
By doing so, it is believed that we will have realized our spouse’s charm and our love will be rekindled.
With this secret motive, my wife reluctantly agrees. Thus, we go on a hot spring trip with the neighbor and his wife.