Yes. eSIMAdvice currently lists 10 Ohayu Germany plans.
The lowest displayed Ohayu Germany plan is Germany · 3 GB · 14 days · 5G, at $7.01.
Germany · 50 GB · 90 days · 5G is the current best-value match by displayed price per GB: $0.88/GB ($43.91 in total).
Yes. Eligible displayed prices already include the active ESIMADVICE coupon where the provider rule applies.