The release schedule for Miya-chan no Kyuuin Life is (every other Tuesday) in Japan. Counting from the release of Chapter 4:
If you enjoyed the quiet intensity of Black Jack or the emotional weight of Team Medical Dragon , this series is your next obsession. MIYA-CHAN NO KYUUIN LIFE- Chapter 4 - Read Next Chapter 5
The chapter title and series pattern suggest a possible newcomer—perhaps a younger volunteer or a relative of Haru-san who initially distrusts Miya. This could create interpersonal friction and a chance for Miya to defend her intentions. The release schedule for Miya-chan no Kyuuin Life