Travel Through the Exiled Prince and Summon the Altar at the Beginning

Traveling through time as an exiled prince, you start in a wasteland with only enough food for seven days. Fortunately, I have an altar in my mind that I can summon—although the first time I only got a temple drawing. Aidan looked at the group of guards in front of him who only knew how to fight but not farm, and sighed. "Build a wall first, lest a wild boar take over your home one day." But this land called "Akihabara" doesn't seem to be simple...