I'm so glad I decided to google Chiisana Glass no Sora and found the continuation of Naoki story. Here's the chronological order of Naoki's story that you can find in mangago: 1. Chiisana Glass no Sora chapter 9 2. Mizu Numuru chapter 4, 5 and 6 3. Chiisana Glass no Sora extra chapter
I'm so glad I decided to google Chiisana Glass no Sora and found the continuation of Naoki story. Here's the chronological order of Naoki's story that you can find in mangago:
1. Chiisana Glass no Sora chapter 9
2. Mizu Numuru chapter 4, 5 and 6
3. Chiisana Glass no Sora extra chapter