Jikuu Mahou de Isekai to Chikyuu wo Ittarikitari
時空魔法で異世界と地球を行ったり来たり
A man gains the ability to teleport between worlds but is betrayed when the king who summoned him tries to force him to wear a slavery collar. Upset by the deception, he takes the princess hostage and returns to Earth. Using his teleportation skills, he travels between worlds with the princess and his younger sister, leading to an uncertain but seemingly content future.