Kaito's path leads him to a bustling town where he learns more about the Eternal Trial System and its grip on the world. Not only are the inhabitants aware of it, but some have embraced the system as a way to gain power. It's here that he meets Lyra, a mischievous elf with her own agenda. She's a rogue with a system of her own, though hers appears to focus more on stealth and illusion.
Their meeting doesn't start on the best terms. After an awkward situation involving Kaito walking into Lyra's bath by accident—thanks to an ill-timed system trial called "Unexpected Encounters"—they strike up a partnership. Lyra's knowledge of the world and Kaito's adaptability make them a powerful team. Together, they begin to tackle the increasingly difficult trials set by the system, each one forcing them into more dangerous and often compromising situations.
Lyra's carefree attitude contrasts with Kaito's initial awkwardness, leading to several ecchi moments—whether it's Kaito accidentally triggering Lyra's clothes-disintegrating illusion traps or ending up in suspicious situations during combat. However, the lighthearted ecchi moments balance with the life-threatening trials, giving the story a mix of humor, action, and tension.