Is this manga really ongoing (in Japan)? Or is it complete or perhaps axed?

Amazon Japan indicates the date of release of the last volume (vol. 4) as 03.28.2008. The release schedule for the tankoubon versions seems to have been pretty consistent at 1 book a year, but after 3 years there has been no vol. 5.

Does anyone know anything about it? Maybe someone who has read Offtopia's scanlation of vol. 4 would care to reply? Because I don't really want to start on this series if it's in danger of being cancelled or something...

~ Bump ~

Anyone 😕

i was wondering the same thing, until i see any concrete prove of vol 5 releasing, i think its completed...
anyway, it does say end of part 1 (does it mean 1st series) end ? & then continue w part 2 as 2nd series vol 1...

I see. Thank you for the reply!