Bundled with manga's tenth and eleventh volume.

A high school boy named Haru and his mother are living overseas. His mother orders him to take care of and "civilize" his adoptive brother Ren, a wild young boy who dislikes talking with other people. While their relationship is adversarial at first, they grow closer as they begin to understand one another.
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(Source: Anime News Network)

While spending summer with his mother, Haru meets Ren, a boy newly adopted by his mother. Getting along with Ren isn't easy as Haru's goal is to "civilize" him by the time summer ends. Their relationship slowly improves as Haru spends more time with Ren and in return Ren steadily warms up to him. Can they really become a "family" at the end of summer!?<br><br>

(Source: Kadokawa, translated)

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