I Got Caught Up In a Hero Summons, but the Other World was at Peace Vol 9

From the Seven Seas Entertainment edition

CHRO MAKES HER MOVE! Chro and Kaito visit Lilia's residence to discuss profits from Kaito’s magical calculator! Meanwhile, Kaito's sleepover date with Isis leaves him determined to learn more about the realms he traverses. But the sleepover leads a jealous Chro to surprise Kaito by getting much closer to him...literally!

Source: Penguin Random House API