Yahigashi Building is a dungeon in Shin Megami Tensei: Devil Summoner. However, it is a scripted segment with little interaction from the player aside from choosing stats to increase upon level up.
The Yahigashi Building is the first dungeon in Shin Megami Tensei: Devil Summoner. The protagonist is asked by his girlfriend Kumiko Hatano to get tickets to a concert here, but he encounters demons. A mysterious man saves the protagonist from the demons and says the place has been transformed into an Otherworld, and that the protagonist must come with him, though he does not guarantee the protagonist will make it out alive. The protagonist follows the man, who kills any demons along the way. On the third floor, they encounter a thug named Takashi who says that everyone in the building has already been killed. Takashi summons four Pisacas, which are defeated by the mysterious man, and the spell on the building is lifted. The man, Kyouji, threatens the protagonist to stay silent. His partner Rei berates him. After Kyouji leaves, Rei tells the protagonist that he will not be able to get the concert tickets.