You and Yanagi walked together towards the classroom. As you approached the entrance, you suddenly turned to Yanagi with a warm smile and said, "Bye-bye" while waving. Yanagi, a bit surprised, responded, "Oh, goodbye." You chuckled and playfully teased, "Yanagin, Bye-bye" He smirked and nodded, saying, "Right, right.." you continue "Yanagin, Bye-bye!" The two of you exchanged farewells with a hint of laughter & gave you a head pat before before parting ways.