Elf-chan no Shusseiritsu Teika ni Okeru Kousatsu to sono Kaiketsusaku no Jissen

Elf-chan no Shusseiritsu Teika ni Okeru Kousatsu to sono Kaiketsusaku no Jissen cover

(ふたけっと19) [ぐるぐる本舗 (池田和宏)] エルフちゃんの出生率低下における考察とその解決策の実践