A lonely human was given a chance with three wish and he wish that have a guidance system it will not have some inteligence and its job is mainly for guidance like how to do this and that or I wanna learn this and that and his next wish is a soulmate and his last wish is that the world will go to trials like this dungeon tower and he will ask a request and that is to alter his memory so that he will only has one wish and that is the guidance system.
make it so they are a childhood friend and the dungeon calamity is to happen when they are a wed couple and have two children that they rise using their system moral physicaly and mentality.