Preserve the source name
Official store copy names Zirian’s mechanical companion Cuckoo, while the released achievement metadata separately uses Cuco. This guide treats Cuco as written in that achievement source.
Reunion condition
The confirmed goal is a meet-up/reunion milestone. No additional quest steps are invented from the achievement wording alone.
Avoid name-based assumptions
Do not assume Cuco and Cuckoo are identical or unrelated without stronger source evidence. The page keeps the ambiguity explicit.
Use as a completion checkpoint
If the reunion goal is still missing late in the run, audit story progression before treating it as a hidden collectible or optional secret.
Core game facts are limited to the official Steam store/demo and official Steam news; achievement-specific scope is based on released platform achievement metadata.
Common questions
Does this page invent quest steps?+
No. It uses the confirmed character/location clue and adds exact route steps only after verification.
Where should I go for full progression?+
Use the main walkthrough for route order, then return here for the named entity or location.