Nico-nico-nii

A person in a black mask with large inflatable ears and a sailor-style outfit sits on a couch, repeatedly opening their mouth in a wide, screaming expression while moving their head and arms. The scene cuts to an animated girl with a similar expression, then to the person lying face down on the couch, before returning to the screaming pose. The setting is a room with bookshelves and a display case filled with figurines.