After School Labyrinth Adventurer ~ I'm now able to go back and forth between Japan and another world, and I'll work hard to level up~Houkago no Dungeon Diver: Nihon to Isekai wo Ikiki Dekiru You ni Natta Boku wa Level Up ni Isoshimimasu; 放課後の迷宮冒険者〈ダンジョンダ・イバー〉　～日本と異世界を行き来できるようになった僕はレベルアップに勤しみます～; 放課後の迷宮冒険者　～日本と異世界を行き来できるようになった僕はレベルアップに勤しみます～; Houkago no Meikyuu Boukensha: Nippon to Isekai o Ikiki Dekiru You ni Natta Boku wa Level Up ni Isoshimimasu; After-School Dungeon Diver: Level Grinding in Another World; After School Labyrinth Adventurer: I'm Now Able to Go Back and Forth Between Japan and Another World, and I'll Work Hard to Level Up