The Other Side of the Legend Full Walkthrough and Details | Neverness to Everness ( NTE )

Requirement: You need to have Nanally in your roster

An anxious resident is reporting about a strange "anomaly" to the BAC

[1] Head to the Bureau of Anomaly Control

Go to the Anomaly Safety Department Service Counter and you'll see an anxious resident complaining about a strange "anomaly" that may sound familiar.

[2] Talk to the Anxious Resident

Switch to Nanally and talk to the resident to complete the quest.

"The Other Side of the Legend" achievement