The search term is popular for a reason. Fans love the character interaction, which is often considered more engaging than larger, mainstream visual novels.

There is no published academic paper, research article, or credible documentation about "Mega Neechan APK v101." Most references are from APK download sites, forums, or social media, which are not reliable sources for a paper.

No, installing apps from third-party sources will not void your manufacturer's warranty.

An app named "Mega Neechan" with spyware could record your keystrokes (grabbing passwords) or access your camera/microphone.