Two Worlds at a Time - Chapter 7: What are these terms?

An unnamed 34-year-old Japanese NEET is evicted from his home following his parents' death.

Upon some self-introspection, he concludes that his life was ultimately pointless.

Walking down a street he intercepts a speeding truck heading towards a group of teenagers, in an attempt to do something meaningful for once in his life he manages to pull one of them out of harm's way before getting himself in the way of the truck and dying.

Awakening in a baby's body, he realizes he has been reincarnated in a world of sword and sorcery.

He resolves to become successful in his new life, discarding his past identity for his new life as Rudeus Greyrat.

Shi Jin once read a book. It was supposed to be about satisfying the desire for vengeance.

Since Suri disappeared, smiles and laughter seemed to have disappeared from the Clarke family home. Christian, who feels responsible for the disappearance of his younger sister, turns into a terrible figure, all ways and efforts Christian do to find his sister. In his search, Christian accidentally meets a girl who manages to return laughter to him. As his feelings deepen for the girl, Christian must be faced with a painful reality that makes him have to choose to continue his story or end it.

Elena Wilson, an ordinary girl who has a simple dream turns out to have many secrets. What is that secret? Was he the one who saved access to find Suri?