Do I need to download an app to watch After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid?

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

After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid — Watch Free (14 Eps)

Name: After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid
Genre: Counterattack

Where can I watch After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid online for free?: All 14 episodes are free on dramatap and play straight in your browser — no app download and no account needed.
How many episodes does After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid have?: 14 episodes in total.
Do I need to download an app to watch After My Sister Pushed Me Into the Sea, I Awakened as a Mermaid?: No. It plays in any mobile or desktop browser, so there is nothing to install.