To confused readers: Junnosuke is jumping around the timeline hence his (and your) confusion on why a seemingly linear story has disjointed continuity. There are clues that indicate the specific dates scattered about in most cases such as a mobile phone screen, his alarm clock, or dialogue.
I have a rough linear timelime that I'm keeping track of that might be useful for others.
August 2016 timeline of events:
1 - The group met Ruu
4 - Junnosuke hugs Ruu outta nowhere
5 - 2yr anniv of Junko-san's death; cat mascot shoot
? - Theme park shoot; bunny mascot shoot; ferris wheel
? - Location scouting/filming with Nozomi
15 - Study group
16 - Implied sex at the riverbank
20 - Tanabata festival; Ruu's death
23 - The police visits Junnosuke's home; Junnosuke hits Akari (not shown yet, just mentioned in conversation)
24 - Junnosuke gets a haymaker from Kuma, meets with Akari to talk about his scattered movie/memory and their "study group 9 days ago"