Mood: The mood of the video appears to be melancholic and introspective, with a theme of longing and possibly lost love. The title 'Sharing Small Moments' and the tagline 'For Those Who Left Home' suggest a sense of nostalgia and yearning. The overall tone seems to be bittersweet, evoking feelings of sadness and reminiscence.

Environment: The environment or setting of the video seems to be a confined, intimate space, possibly a train or a vehicle, as hinted by the illustration of a bus/train in the top left corner and the window reflection in the main image. The setting may also involve a journey or travel, which could be physical or emotional.