The Heroic Spirit Summoned by Mistake [Crossover]

[Abandoned. Read at your own discretion, and don't give me a completion rating.] A Heroic Spirit mistakenly summoned during a seven-month mock Holy Grail War is forced to transmigrate to another world and change classes every night after the Phantom Thief Kid finishes stealing something. #What class will Arthur be today? Saber or Caster?# #Arthur wakes up in bed to find himself in another world. His heart aches, but he says nothing.# #Eventually, he discovers that the culprit is the famous Phantom Thief Kid. At night, he pulls out a world-destroying Noble Phantasm and chases Kid all over the place.# #Kid/Arthur still haven't had their secret identities exposed today, teeheehee.# "User's Guide" ○ Pairing: Phantom Thief Kid/Kuroba Kaito ○ No fighting or ranking-hunting. If you don't like it, please click the X in the upper-right corner. Thank you. ○ Top and bottom are undecided. Use your imagination. ○ The summary is adapted from "Dala Bengba." The plot has nothing to do with the summary. ○ The characters belong to the manga's author. Any OOC is my doing. Theme: