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Keiki’s younger sister (who is later revealed as the one who left the letter).

The story revolves around , an ordinary high school student who has never had a girlfriend. One day, he finds an anonymous love letter addressed to him in the calligraphy clubroom. However, the letter is accompanied by a mysterious "gift": a pair of white panties. Keiki’s younger sister (who is later revealed as

Originally written by and illustrated by sune , the series spans various formats: Keiki’s younger sister (who is later revealed as

The beautiful, third-year president of the calligraphy club. Yuika Koga: A library committee member of foreign descent. Mao Nanjo: Keiki's tsundere classmate. Keiki’s younger sister (who is later revealed as