The very popular different world comedy in Kakuyomu is finally made into a book! Without being run over by a truck, Katou, a high school student with a Chuunibyo disease was summoned to another world. “Now, I’m gonna be the strongest harem protagonist!”, at this time a mysterious “Login Bonus” was given to the delighted Katou!? Elixir on the first day, on the second day is an elf princess (beautiful girl), a magic sword (that can transform into a little girl) on the third day. In addition, he can get even more continuous login bonus, and powerful cheats increase every day just by him living!! And then Katou noticed. With this power, he can freely explore the other world, even the Demon Lord and Spirit Lord were added to his harem and ― “I’ll take the world with this power!!” Katou’s most enjoyable life in a different world begins now! The popular different world comedy from the Web has begun!!