My Little Sister Can Read Kanji: Volume 5

Gin continues to spend relaxing days with Yuzu and his sisters, though he can feel Kuroha's jealousy gradually accumulating. But one day, Professor Choumabayshi tells him something ominous: “If you don't get together with Kuroha, she'll be erased.” Kuroha has become a key factor to changing history, and the forces of evil are aiming for her. For the sake of moe culture and everyone he loves, Gin paves the way to the future!