聖グロGW旅行

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Source: https://www.pixiv.net/artworks/98014061
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ゴールデンウィーク旅行で特急に乗り込む聖グロ生徒です。

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Source: https://twitter.com/omatiosake/status/1520212710197129216
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It's St. Gloriana's Golden Week trip.

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Source: https://www.pixiv.net/artworks/98014061
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It's St. Gloriana's students boarding an express train for a golden week trip.

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Source: https://twitter.com/omatiosake/status/1520212710197129216
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golden week - the week from 29 April to 5 May containing multiple Japanese holidays.