Yamamoto often designs female leads with "mature" looks—tall, athletic, or professional—contrasted with a deep sentimental attachment to their past.
Major retailers like Amazon JP or Melonbooks stock his compiled volumes. [Yamamoto_Zenzen]_Kodomo_no_Koro_Suki_Deshita_(...
As this is an adult title, it is available through specific Japanese digital and physical retailers: [Yamamoto_Zenzen]_Kodomo_no_Koro_Suki_Deshita_(...