A chat group novel, with some revisions made. Please bear with me.
Pili War God Pikachu is the group owner, and the protagonist, fifteen-year-old Morgana, is a member. Other group members include Kurenai Otoya, the free-spirited Kamen Rider; Nana, who loves rock music; the young magical girl Rin; Luohou, who is nothing but a head in the Pili world; Kaoru Ichijo, the police officer from Kuuga; Karna from the Type-Moon Throne of Heroes; Jiraiya from Naruto; Wuming; Xiao Jian Dun, the Smiling Blade of Heaven's Mandate; Gin Ichimaru; Itachi Uchiha; Yugi Muto; Yui Yuigahama; Satanichia; Old Ghost Yeyun, and more...
Volume One: Mostly set in the Kamen Rider Kuuga world.
Volume Two: The Fourth Holy Grail War in Type-Moon.
Volume Three: The Bitter Realm dungeon.