I must have missed episode 5 the first time through, maybe it didn't get posted or something.
It's not that it's that unusual of a story, but for some reason, well, I don't really have the words, it hits close to home for some reason.
Warning: Spoiler! Kobato in trying to get better at reading a picture book story about a firefly, is told not to read it by an unahppy man in the park. Eventually it's revealed he's the author, but hasn't written since. Kobato insists he come out to see the fireflies at night and we find out the man once had a girlfriend, who insisted he come see the fireflies with her long ago (she also made the illustrations for this book) - but he was too busy and had no time. When he finally found the time and agreed to meet her, she never made it. She was hit by a car. He sees her in the hospital and asks if he can do anything for her; she still talks of seeing the fireflies. They don't tell you if she survived or not, but it's implied she at least lost her vision. He deeply regrets not making the time, which is why he stopped writing books.
The man then decides to leave and Kobato follows, but slips and falls, sliding down a hill. The man finds her and picks her up. After seeing she's okay he turns around and realizes through one of the pictures from the book, he was standing in the same spot she'd painted, the spot she wanted him to come to so long ago. About now, the fireflies begin to come out for the evening. Finally, he sees what she'd wanted to show him.
Because of this, he's able to move on and write again, and Kobato gets another kompeito for her bottle.
But then this series if you watched it in one session would be good for at least two boxes of kleenex anyways. Save the money, just use a big bath towel.