Four short stories about adventures of little sisters:

1. Stray dog ~Leave it to Nana!~ (Nana ni Omakase!)
   
2. Paper doll ~Changing doll Mikan~ (Kisekae Mikan)
   
3. Family trouble ~Yui's papa is shamless!?~ (Yui no Papa wa Harenchi!?)
   
4. Secret feelings ~Momo and angel's flute~ (Momo to Tenshi no Fue)