Kaki Gentei: Tropical Parfait Jiken

Kobato-kun and Kosanai-san are now in their second year of high school. The two hide their true natures as "fox" and "wolf," and try to act like ordinary small-time citizens, but this summer, there is something sinister in the air...?
(Source: Square-Enix, translated)
Note: Second entry in the Shoushimin Series.