Ms. Serious is Ms. Slack
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Ms. Serious is Ms. Slack is a completed manga by Yano Toshinori, first published in 2016. It blends romance and comedy. You can read all 4 available chapters of Ms. Serious is Ms. Slack online for free on MangaPulse; the newest is Chapter 3.5, added 2019-10-27. The series is finished, so you can read it from start to end in one go.