4-Nin wa Sorezore Uso o Tsuku
4人はそれぞれウソをつく · よにん わ それぞれ うそ お つく
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
What do an alien, former ninja, weak telepath, and boy pretending to be a girl have in common? They are all classmates at Kashihara Girls' Academy, and they hide their true identities from the world. Rikka, Chiyo, Sekine, and Tsubasa seem like the best of friends, but they each harbor a monumental secret that they cannot reveal, no matter what. In order to continue masquerading as normal middle school girls, each of them must invent creative ways to conceal their true selves. But that is easier said than done, as the four students end up entangled in numerous shenanigans along the way.
Source: AniList
Synopsis 日本語
橿原女学園中等部に通うリッカ、千代、関根、翼は、クラスで最も仲の良い4人組。しかし実は、彼女たちは周りにはおろか互いにも言えない秘密をそれぞれ抱えていた。実はリッカは宇宙人、千代は抜け忍、関根は女性の心が読める超能力者、翼は姉と入れ替わり女装をしている男子生徒だった。
Source: Wikipedia「4人はそれぞれウソをつく」 (CC BY-SA 4.0)
External databases: MADB · AniList · Wikidata
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections