Hi! Sorry to double reply, but I just wanted to confirm with you that the Summer volume is also a light novel, I guess the one you are talking about? I'll purchase that and the regular one, but I'll save them until I'm done with the manga, I just really want to see what the manga has first hehe Also do you know if the manga is complete at 3 volumes? I only see up to 3 for pre-order.
Yep, Summer is also a light novel and is the sequel/side volume I was talking about before.
As for the manga, it does appear to still be ongoing. Volume 4 just came out in Japan over the summer and looking at the synopsis I think it's probably only halfway through the content of the original LN, so still plenty to cover!