Mysterious Girlfriend X
[de] Nazo no Kanojo X
[es] Nazo no Kanojo X
[fa] دوست‌دختر اسرارآمیز ایکس
[id] Nazo no Kanojo X
[it] Nazo no kanojo X
[ja] 謎の彼女X
[kk] Nazo no Kanojo X
[km] មិត្តស្រីអាថ៌កំបាំង X
[pl] Nazo no kanojo X
[ru] Nazo no Kanojo X