各自が(かくじが)自分の(じぶんの)プライドや(ぷらいどや)嘘(うそ)、エゴを(えごを)守る(まもる)ために、自分に(じぶんに)都合の良い(つごうのよい)話をした(はなした)から

In this way, all three individuals involved in the incident each claimed 'I killed him (or committed suicide),' asserting different stories. Everyone insisted on a story convenient for themselves in order to protect their own pride, lies, and ego. Thus, the truth was completely wrapped in darkness, vanishing into the bamboo grove ('In a Grove') as the phrase goes. It is an immortal masterpiece depicting the essence of human ego.