'Nagai Go no Horror Gekijo: Kirikagami' (1992) - Hidehiro Ito.

Maestro animator, Go Nagai introduces this ghastly tale of blood-thirsty slaughter from beyond the grave! The querulous rehearsal of a melodramatic play is disturbed by two cast members breaking into a locked and inadvertently awakening the once dormant demon therein! The amorous couple make some disturbing discoveries about the nefarious crimes perpetrated within the very same building which now houses the theatre! Recalling, Lamberto Bava's Demons, the gruesomely beleaguered theatrical troupe are nightmarishly trapped inside the ill-fated theatre, with no hope of escape from the vengeful supernatural samurai's grisly wrath! Cut off from the outside world, the phones are all dead, and, very soon they will be too!!!! Somewhat talky, but darkly atmospheric, the cast deliver fine performances, and the menacingly smoke-slathered, sword slashing Samurai demon proved strikingly sinister. More adventurous J-Horror fans will find Nagai Go no Horror Gekijo: Kirikagami a worthwhile watch.