Dad says he’s going fishing tomorrow. Maruko decides to come along and even invites Grandpa too. Dad is already worried that having to look after Maruko will make fishing difficult enough—adding Grandpa on top of that nearly pushes him over the edge. Then, just as the three begin fishing, an amateur old gentleman comes over to them…
お父さんが明日、釣りに行くという。まる子はおじいちゃんを誘って一緒に出かけることに。お父さんはまる子一人でも大変なのにおじいちゃんまで面倒見なければならなくなり、釣りどころではない。釣りを始めた三人の前に素人なおじちゃんが近づいて来て…。