Eromanga Sensei Episode 9: Little Sister and the Fairy Island
Episode 9 of 12 of Eromanga Sensei, aired June 3, 2017, 25 minutes. Available with English subtitles and dub where released.
Episode summary
"I'll call it the 'Summer Data Collection and Writing Camp'!" As a result of one of Elf's ideas, the light-novel authors end up heading to a vacation house on an island in the “South Seas”. How far can Elf push the "Data Collection" card?