Sake

Sake is an alcoholic rice wine created in Japan and used in ceremonies.

When Katakuri Ninja Clan member Masayo overheard The Director talking about how he must manipulate clan leader Isako into doing his bidding, she notified the assistant administrator Haruko Muroi. Muroi responded that it would take more than hearsay to convince Isako. She advised to constantly provide Sake to The Director so that his tongue would be loosened and that he might slip up in front of Isako.

External link
Sake on Wikipedia