Another plot could involve them traveling to a time before Ulquiorra was an Arrancar. This would give Orihime a chance to see a different side of him, perhaps a more human side. They could then try to find a way to prevent his transformation into an Arrancar, which would have a huge impact on the future of Hueco Mundo and its relationship with the Soul Society.
One idea could be Ulquiorra and Orihime getting sent back to the early days of Soul Society. They could end up changing the course of events that led to certain battles. For example, they might prevent the initial conflict between the Soul Reapers and the Hollows in a way that alters the power dynamics in the Bleach universe.
A possible plot is that they time - travel to a future where the Soul Society has been completely destroyed. They then have to figure out what led to this disaster and try to change the past to prevent it. Along the way, they might discover secrets about their own powers and the true nature of the Bleach world that they never knew before.
The best chapter pointer here is Chapter 46, "Why Am I Second to Last?!". It opens with Upon hearing this, everyone but Jiang Li perked up with high alert. and closes on Did you calculate the score incorrectly?!" And 13 points?!.
The best chapter pointer here is Chapter 8, "Is He Shameless?". It opens with The resentment that had barely calmed among the crowd surged back two... and closes on Other people with a handsome and charming appearance often try to conceal....
Look to Chapter 20 for the clearest answer. It begins with Several people turned their heads upon hearing the sound and saw three..., keeps building through She was clad in a long black dress, and the dull color did not hide her..., and lands on So, he turned and questioned Jiang Li..
A practical answer is Chapter 38, because it turns the idea into a concrete scene. The chapter opens with Jiang Li had also observed the girl who had just entered., adds pressure through When did Jiang Li become so rational and composed?!, and ends on He Yun coldly turned his head and continued to.
A practical answer is Chapter 4, because it turns the idea into a concrete scene. The chapter opens with Qiao regretted her words as soon as they left her mouth., adds pressure through It's difficult for us when you ask for a guest's room number and key right..., and ends on A little girl acting.
If you want the clearest chapter reference, go to Chapter 51. Early on, Oh, okay." After uttering two syllables indifferently, Jiang Li bent down...; later, the chapter leans on By the time she reacted, Jiang Li had already disappeared at the end of....
Chapter 939, "When Did the River Moon First Illuminate People? [Extra · River Moon Chapter]", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
The best chapter pointer here is Chapter 40, "The National Museum Speaks!". It opens with [Jiang Li claims she copied this herself? and closes on The handsome guys on this show are so difficult to deal with..
If you want the clearest chapter reference, go to Chapter 18. Early on, In the corner, a girl in a black dress sat quietly, holding a glass of...; later, the chapter leans on Her serene yet cold temperament, along with her exquisitely beautiful....
The best chapter pointer here is Chapter 5, "Catching Adultery Personally". It opens with Actually, when Manager Fang saw Jiang Li, he was somewhat surprised. and closes on Recently, he did suspect that his wife was cheating on him, but due to the....