User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-26952857-20180419020450/@comment-26952857-20180419152045

you're wrong striker10, issei started his 3rd year since volume22.

all preliminary matches of the world rating game tournament happened during his 3rd year of highschool. like i mentioned in previous comment, on volume23, it was already mentioned that 1st trimester has ended along with the inter-club competetion... so that's already 3 months and vol24 started near summer vacation.