I need the visa?

The fact is that I bought a trip:
1 Flight: barcelona to Peking (I will stay 5 days)
2 Flight : Peking to Hiroshima (but the company does an stop in Dalian 2 hours) so I will not go outside from the airport in Dalian. Only the transfer
3 Flight : Tokio to Barcelona (stop in Peking and I will stay in airport 2 hours)
My doubt is in the flight from Peking to Hiroshima.
If I stop in Dalian maybe they ask me for the VISA, but is only the connection to Hiroshima.
Thanks in advance