Series of doujinshi under the name Wnd (Wonderful Nyan-Days):

1.WND(2004)
Puppy-Asrun accidentally mangles his master's precious paper flower and is punished with house-arrest. Kitty-Issac comes to the rescue, since the park just isn't the same without Puppy-Asrun to ogle.

2.WSD(2004)
Evil loansharks steal Issac-kitty from his dirt-poor master Deakka, but Asrun-puppy pesters his master Kira into a joint rescue mission. Naturally the loansharks are defeated and yakiniku is had by all...

3.WND Summer(2004)
Deakka and Kitty-Issac win an all-expense paid beach vacation getaway and invite Kira and Puppy-Asrun to come along. But oh noes! Puppy-Asrun is terrified of his carrier and won't get inside!!

4.WND123(2005)
Issac convinces Asrun that he'll die if he doesn't eat his gift of chocolate, of course it's not true, but Asrun might die from the sugar-rush anyway...

5.Little Twinstars(2005)
Kira is studying for exams and Asrun is being dejectedly ignored so Deakka plays good samaritan and takes him out to the park to play. In the park, Asrun meets a new friend and skins his knee. The new friend wraps it up with a handkerchief but is chased off by an irate Issac who thinks he made Asrun cry. Can the handkerchief be returned?! Will Issac apologize?! Will yakiniku be had by all?!?!?!?!.

6.Hop Step Jump(2005)
Kira has a cold and Asrun is convinced he's dying, but Issac's down with a cold too and can't help out as usual! Who's left to save the day? And how will Issac react when he wakes up and finds out he's not the only hero anymore?!

idiotic kitty cuteness
Issac X Asrun
(from doki-doki)