1 7 , ▁ 1 9 9 8 , ▁to ▁August ▁ 2 0 , ▁ 2 0 1 1 . ▁Finally ▁two ▁more ▁volumes ▁titled ▁Side ▁Ar ms ▁foc using ▁on ▁the ▁past ▁of ▁some ▁characters ▁( which ▁form ▁the ▁side ▁story ▁collection ) ▁and ▁the ▁birth ▁of ▁M ith ril ▁and ▁Am alg am ▁have ▁been ▁published ▁on ▁April ▁ 2 0 , ▁ 2 0 0 4 ▁and ▁July ▁ 2 0 , ▁ 2 0 0 6 . ▁In ▁contrast ▁to ▁the ▁full ▁length ▁volumes , ▁short ▁story ▁collection ▁focus es ▁on ▁the ▁comedy ▁elements ▁from ▁the ▁series . ▁In ▁January ▁ 2 0 1 0 , ▁G at oh ▁wrote ▁another ▁of ▁these ▁stories ▁in ▁celebr ation ▁of ▁G ek kan ▁Dragon ▁Mag az ines ▁ 3 0 0 th ▁issue , ▁which ▁has ▁been ▁included ▁in ▁the ▁last ▁short ▁story ▁collection ▁volume . ▁Another ▁series ▁of ▁spin - off ▁nov els ▁has ▁been ▁released ▁by ▁Na oto ▁ Ō g uro ▁with ▁super vision ▁of ▁Sho ji ▁G at oh ▁from ▁August ▁ 2 0 , ▁ 2 0 1 1 ▁to ▁February ▁ 2 0 , ▁ 2 0 1 6 , ▁consisting ▁of ▁th ir teen ▁volumes ▁and ▁set ▁years ▁after ▁the ▁original ▁series ' ▁ending . ▁The ▁light ▁nov els ▁have ▁also ▁been ▁adapted ▁into ▁various ▁m anga , ▁as ▁well ▁as ▁three ▁an ime ▁television ▁series ▁and ▁an ▁O VA ▁episode ▁for ▁which ▁G at oh ▁was ▁also ▁part ▁of ▁the ▁staff .