The slow burn feels just right. Fixing someone isn't that easy of a job like you always see. It really hit close to home when I have someone suffering from depression for very similar scenario (stress from corporate structure change couple with team members quit in droves, then last nail with lost of close relative). This manga feels so real.
BTW, mackerel boiled in water sounds so yucky, lol. Just boiled mackerel might sounds more appetizing.