>>59
In 東京弁 (Tokyo dialect) it's pretty common to drop the final vovel of a word so yuyushiki can quickly become yuyushk. As for when it's shki instead of shiki, し (shi) often becomes Sh when there's a hard sound like tsu 質問 or ki　四季 after, but I don't think there's a hard rule for it.

Are you enjoying the show? I just finished all the Non Non Biyori seasons (cute and relaxing rural life show) and started Gakkou Gurashi.