Do I need to download an app to watch Apocalypse Game: Mess with Red, Get Dead(English-dubbed)?

No. It plays in any mobile or desktop browser, so there is nothing to install.

Apocalypse Game: Mess with Red, Get Dead(English-dubbed) — Watch Free (70 Eps)

Where can I watch Apocalypse Game: Mess with Red, Get Dead(English-dubbed) online for free?: All 70 episodes are free on dramatap and play straight in your browser — no app download and no account needed.
How many episodes does Apocalypse Game: Mess with Red, Get Dead(English-dubbed) have?: 70 episodes in total.
Which app is Apocalypse Game: Mess with Red, Get Dead(English-dubbed) originally from?: It was originally released on ReelShort.
Do I need to download an app to watch Apocalypse Game: Mess with Red, Get Dead(English-dubbed)?: No. It plays in any mobile or desktop browser, so there is nothing to install.