Letter from Sister Guide - Blue Protocol: Star Resonance

Letter from Sister - Guide

Discover all Letter from Sister locations in Blue Protocol: Star Resonance. Use the interactive map to find spawn points, mark progress, and get tips for each item.

This guide lists 1 known Letter from Sister across 1 maps. Use the map tracker below or highlight coordinates directly.

Last updated: May 6, 2026

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Asterleeds Progress Tracker

Track your discoveries and progress for each spawn. Right-Click on the icon on the map to mark it as discovered or undiscovered.

Letters & Documents

Letter from Sister(0/1)

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