Saki/Companion

Saki's going on a world tour.

Pocket Castle
Dialogues with ???

Grandeur Theater
You reach 100 Affection with Saki and she gives you her pass, you can unlock stage shows at the Grandeur Theater if you bring her along on the first visit.

She is required for several shows.

Additionally, Saki has several "Live Shows" at Grandeur Theater where she fucks Luka on stage.

Trivia

 * Aside from Battlefuckers, Saki's theater scenes make her the only character who has H-scenes outside of loss scenes and Pocket Castle requests.