This article describes the recent history of calorimetry and thermal analysis in the Faculty of Arts and Sciences at Fujiyoshida, Showa University, at the base of Mt. Fuji. Sample observation TG-DTA of a light curing composite resin comprising bisphenol A glycidyl methacrylate (bis-GMA) and triethylene glycol dimethacrylate (TEGDMA) was conducted to observe thermal shrinkage due to residual stress and color change, generated in the photopolymerization process. TG-DTA results for inclusion compounds (ICs) using 2,4,6-tris(4-chlorophenoxy)-1,3,5-triazine (CLPOT) as a one-dimensional (1D) host material are also reported. In CLPOT ICs that incorporated free radicals such as 4- substituted-2,2,6,6-tetramethyl-1-piperidinyl-1-oxyl (4-X-TEMPO), desorption of guest radicals from CLPOT nanochannels was confirmed using TG-DTA. The combined results of sample observations and TG-DTA indicated a change in the physical/chemical state of these ICs. In CLPOT ICs that incorporated acetaminophen, a popular antipyretic analgesic agent, TG-DTA played a decisive role in the confirmation of the inclusion of acetaminophen in the CLPOT nanochannels. Sample observation combined with TG-DTA is thus a useful approach to obtain fundamental information on various materials of interest, allowing their future applications to be considered.