4th fighter Daichi has sustained his younger siblings with the help of their uncle since their father abandoned them. He plans to go to an amusement park with them to make a last memory.
The children are under the protection of the Japanese army, but Kako try to flinch away because the system chooses him as 3rd fighter. Chizu has a clue where he is.
Chizu accidentally killed Kako. The system chooses anyone as a substitute for 3rd fighter while Chizu remembers her memories with her family and teacher Hatagai.
The children get a shock to understand the most important rule for getting on Zearth that Koyemshi revealed. Kako loses control of himself with fear. Koyemshi tempts him to ask Chizu out on a date.