Binchou-tan - Season 1 Episode 4 Rainy Sunday

It's raining and Chiku-tan invents a device for walking in the rain without getting wet, which she calls a chikuma. Unfortunately, it is actually a takeuma, which has already been invented. She goes for a walk and meets Binchō-tan. The two sit in an old car and play word games. The sun comes out and they visit a bamboo grove. Kunugi-tan admires a rainbow from her balcony.