Bleach: Season 1, Episode 173

1 - 173: The Appearance of the Great Evil! The Darkness in the House of Kasumioji

Kenryuu and Enryuu discover that Lurichiyo has gone missing and go to Soul Society along with Ichigo and Rukia to find her. While at a tea party Lurichiyo is attacked again by an assasin and Ichigo saves her.