Rin!

Rin! summary: Katsura, a sophomore and archery club member in high school, faces challenges in controlling his anxiety. He discovers comfort in the affectionate embrace of Sou, his sibling's lifelong companion. Sadly, Sou's stay in town is ephemeral. Therefore, Katsura ponders over dealing with his nerves in his absence. To his astonishment, Kouichi, his friend, volunteers to fill the void left by Sou and stuns Katsura with a sudden kiss. Now, Katsura is bewildered and wondering about the implications of this unexpected gesture.