Abstract Schoolgirl Otoha visits her classmate Kouki at the hospital and, at his request, brings him books on physics. Thanks to the inquisitive Kouki, she is fond of physics issues that go beyond the school curriculum. Together, classmates will find answers to questions about how large a mirror should be compared to a reflected object and how to create an artificial rainbow, discuss the nature of the waves, the resonance effect and the Doppler effect, interference and diffraction of the wave, and much more. The manga includes laboratory work, as well as additional material focused on the study of more complex topics: the principle of superposition, the solution of the wave equation, the derivation of the formula for the speed of sound, etc. The publication is intended for schoolchildren and students interested in scientific and technical disciplines.