Possible Clues:

• Type of drama one of Mitford’s aristos backed
• Its players wear masks
• As performed in teatres in Okkaido and Onsu?
• Masked drama whose name means "skill"
• Drama since the 1300s
• Theater art since the 1400s
• Genre of 'The Damask Drum'
• Overseas drama
• Masked drama type
• Over half of lovers' cargo returned, causing drama