Kanata no Kimi no Te

Also known as: 彼方の君の手

by Rainy Wata, Fuku Kajii

Yuudai, a student preparing for university entrance exams, returns to the town he spent his childhood summers in and unexpectedly reunites with Shun, the friend he used to always play with. A certain buried memory resurfaces to throw Yuudai off, and then suddenly a child appears and says something strange...? (Source: Kadokawa, translated) Note: Includes one extra chapter.