これは経費で落ちません! ~経理部の森若さん~ 1

Workplace drama centred on Moriwaka Sanako, an OL working in the accounting department of a soap company. This is structured similarly to a mystery novel, except instead of solving murders Sanako solves accounting anomalies. It's all very low stakes though and focuses more on character interactions and office politics than it does complex plotlines. This first volume also does the groundwork for a romantic subplot, so this definitely feels aimed much more at the slice-of-life crowd than crime fanatics.

Most of the difficulty here stems from the setting, with the trickiest bits being the descriptions of the company's financial policies, and following along with the finer details of the underhand schemes Sanako investigates. I imagine this is intended as a light, fun read for native readers though, so there isn't really anything especially difficult going on with grammar or kanji, so this is probably approachable for someone in the N3/N2 area. I'd guess this sits maybe at around L30 on here, though it will likely feel easier if you happen to be someone familiar with the accounting practises of Japanese companies.