The series is officially completed with one tankoubon volume containing 4 main chapters plus extra content.
The definitive "updated" version for fans includes Chapter 4.5 , which features a postscript and a Melonbooks exclusive extra leaflet. ano ko no kawari ni suki na dake updated
The original manga by Shuusuke Shunjou was serialized between in Comic Mugen Tensei . The series is officially completed with one tankoubon