In the Nocturne Maniax version that features Dante from the Devil May Cry series as a guest character, jumping from the Mantra Headquarters will normally cause your party's HP to be reduced to 1 HP. However, if Dante is in your party, he will take no damage from the fall.

In the Nocturne Maniax Chronicle version only released in Japan featuring Raidou from the Shin Megami Tensei: Devil Summoner games replacing Dante, he also takes no damage if you jump from the building.

These appear to be references to how each character can fall from great heights and land without any visible damage, such as in the beginning of Devil May Cry 2 where Dante successfully lands a jump from a tall cathedral tower.