Hi, I'll try to describe it:
Nage and uke are both in ai hammi and nage has his left foot forward to start. Uke takes a step forward to tsuki with his back hand. Nage takes a step back and with his right hand captures the punch of uke like a kote gaeshi grip. At this point they are both in aihanmi again.
Nage then twists uke's hand outward (to the right) and steps in with his back leg (left leg). He then shuffles more behind uke, lets go of his wrist, and continues the irimi nage like shomenuchi iriminage with tenkan.
That is the one our teacher and assistant teachers are making us do again and again, but I cannot find any videos to help us get this right. Any ideas?
The initial movements are similar to Tzuki Ikkyo Ura. Once you move into the Uke's side, turn your hips and extend your arm that is holding the Uke's wrist downwards causing Uke to be off-balanced - shifting his weight to his front foot. Once Uke is off-balanced, place your free hand on the side of his neck (this is the center, do not pull or push his neck), release his wrist and use the free hand to execute irimi-nage by stepping forward towards Uke's back foot.
Hope this will help.