Turn on CC for English Subs! Part 2 starts at 7:47.
Part 1 has Mizuki celebrating their birthday together with Niigo (and it's hilarious), while part 2 is Mizuki celebrating their birthday with their friends from Kamikou (also featuring MMJ for a bit)! I love seeing all the friends Mizuki has in this card story, it's all so heartwarming. I hope Mizuki will have even more friends to celebrate their next birthday!
Translations and video recordings are all by me and you can also find me on twt @HazeMagica!