From the popular game series Mega Man, the Mega Buster aka Rock Buster makes its appearance!
The "Finger Mega Buster/Finger Rock Buster" can actually be worn on your finger to play with. The length is approximately 6.5 cm (collapsed state), and by extending the base, it can be worn even by those with larger fingers.

Furthermore, the muzzle section features an LED light-up gimmick! It also comes with a ball chain, so you can use it as a keychain.

The volume 1 set includes five different types of Mega Buster: Rock Buster (Blue), Fire Storm (Red), Metal Blade (Brown), Leaf Shield (Green), and Shadow Blade (Purple).