In his book Metaphysics of Temporal Modality, Prof. Isashiki takes a very unique and intriguing approach to philosophy of time. He begins with raising the following three questions. (i) What does it mean to say that the past is determinate or fixed whereas the future is open? (ii) Why is it impossible to see temporal transition from the present to the past? (iii) Does the present have no duration? Answering to those questions, he declares that he does not assume any linear representation of time. In this review, I shall examine to what extent the attempt succeeds and in what respects it fails.