Kokoro Button  

ココロ・ボタン, Kokoro Botan

At the high school entrance ceremony, Eito from the special class assists Niina in overcoming her health issues. His kind demeanor captivates Niina, causing her to reveal her emotions towards him. This marks the beginning of their romantic journey. Over time, Niina struggles with loving Koga as she experiences moments where he appears to manipulate her feelings. For her, being in a relationship with Koga may lead to an uncertain future.