Jun Maeda posted on his Twitter account that he has been hospitalized since Monday, but did not disclose the reason behind the hospitalization. He only stated that he will be receiving treatment for recovering his health.
Jun Maeda, now 41, works for Visual Arts and Key and has written some of the most emotional visual novels/animes in recent times such as Air, Clannad, Little Busters!, Angel Beats!, Charlotte, and Rewrite. He was also the composer behind Angel Beats! and Charlotte and has supervised the audio production behind Kud Wafter and Rewrite. We here at The Outerhaven wish Maeda-san a speedy recovery!
You can see Maeda’s tweet here: https://twitter.com/jun_tenhou/status/704132853324345344