A kid tries to convince his friends that the thing they're afraid of isn't dangerous, just different. That's it. That's the whole story, and it works because Keroppi doesn't argue or prove anything, he just keeps showing up with Wink, patient and certain. The OVA lets you sit in that quiet space where acceptance either happens or it doesn't, no dramatic breakthrough required.
Wink is a kind-hearted snake and a good friend of Keroppi. Keroppi hopes to introduce Wink to the rest of his friends, but when they meet him, they decide that a snake must be a dangerous creature. What follows is a short fantasy story about first impressions and judging others by what they are rather than who they are. The question at its center is simple: will Keroppi's friends come to accept Wink in the end?