Number Theory: Dreaming In Dreams - Proceedings Of The 5th China-japan SeminarThis volume aims at collecting survey papers which give broad and enlightening perspectives of various aspects of number theory. Kitaoka's paper is a continuation of his earlier paper published in the last proceedings and pushes the research forward. Browning's paper introduces a new direction of research on analytic number theory quantitative theory of some surfaces and Bruedern et al's paper details state of the art affairs of additive number