even though there is no
風もないのにドアはひとりでに開いた。
The door opened by itself even though there was no wind.
縁もゆかりもないのに親切にしてくれた。
Even though we were complete strangers, they were kind to me.
が、彼はどうかすると、全然何の理由もないのに、その時の彼を思い出す事がある。
But sometimes, for no reason at all, he finds himself remembering him as he was then.