Konata (こなた)　and Kagami (かがみ). Original title is “お疲れの二人” which translates to “two tired people”. The author comments: “…小学生時代、遠足帰りのバスで、こんな形で寝ている女子２人の姿を見たことがあります。” which can be translated to “…When I was in elementary school, I once saw two girls sleeping like this on the bus on the way home from an excursion.”. Very cute!

src: https://www.pixiv.net/en/artworks/2976136