Reigen Spinoff Manga 4.5: Illusionary Forest (Short Fandub) 

as in like only two pages of the forest incident from that chapter to put emphasis on in a video
ch 4.5 as a whole is very great but this specific part of it is my favorite
voices:
Reigen - Roo
Tome - Mobbu (m.youtube.com/...)
Hoshida - anonymous
(the title is just 'illusionary forest' because the fan-translation calls it 'Tayori' and the localization calls it 'Reliance' )