Sora (Limited, Rerun)
Radiant Vow Rubi (Limited, Rerun)
Reroll for Sora.
If you have the patience, reroll for Sora and RVR.
Simple Rerolling (Don't start with limited units): Same process as always (Link to guide)
Advanced Rerolling (Start with at least 1 limited unit): Use the Advanced Rerolling guide (Link)
Considering that we just had a limited combo banner recently, it is unlikely that we'll get another one soon.
If you don't have Sora or RVR you might have to pull their individual banners even if it technically isn't as efficient.
Fortunately, both of their banners now feature a 120 tickets rebate when you spend 600 tickets (120 pulls), effectively bringing the max price down to 480 tickets. This is a much more sensible price.
If you had to pick between Sora or RVR, go for Sora.
Resupply this week.
Sora bond: Skip
Rubi bond: Get if you have RVR and don't have a +30 copy of her bond yet.