When Rengoku was in Mugen train he Fatally wounded from his struggle with the Upper rank demon, Rengoku passed away peacfully with a smile on his face, All Hashira Heard of Rengoku's passed away...

Tengen: An Upper rank demon is Powerful enough to defeat Even Rengoku...

Mitsuri: Shock and about to cry

Muichiro: .....

Shinobu: I see... Rengoku didn't make it.

Obanai: I don't believe it...

Gyomei: Namu Amida Butsu...

Sanemi: I'll kill 'em all. Every last one of 'em.

Giyuu: I see...