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Nannimo Umaku Ikanakattara Dou deshou

It's a big day for our protagonist, Usagida. She gets on an early train, unable to suppress her worries that something might go wrong during her high school entrance exam. Trying to go over her notes just makes her anxiety worse... When she finally can't help but burst into tears, a certain someone calls out to her...

(Source: MANGA Plus)