[DeepL Translation - needs review] Introduction to Volume 1: A bookstore clerk, Sankaku, has always had the ability to see spooky things. Although Reikawa is a skilled psychic, he lacks emotional and life skills, so Triangle is often called upon to serve tea and "read the air". Then, he encounters a murder case... This is a psychic entertainment of the uneven duo!
(Translator: DeepL)
Mostly character development in this volume. Also if raunchy scenes make you squeamish this is the time to duck out. It's not explicit (...or even actually sex?) but all the same. Think the language got harder in this volume but might just be because it felt significantly more dialogue heavy with fewer ghost scenes.