Misaka is Misaka's sister book.
(C79) [Kyourakuen (Aku)] Toaru Level 5 no Oyogikata. (Toaru Kagaku no Railgun)
(C77) [Sago-Jou (Seura Isago)] Ryoujoku Tama-nee Mousou (ToHeart2 Dungeon Travelers)