Was Natsuki's first love, Atri? His beautiful childhood memories are gradually being overwritten. Despite his unwillingness to admit it was her the facts around him are lining up to force him to, but he continues to deny it. 
Why does it make you happy if I have a heart?
لماذا يُسعدك وجود قلب لي؟
Warum bist du glücklich,
wenn ich ein Herz habe?
¿Por qué te alegra que tenga corazón?
¿Por qué te alegra que tenga corazón?
Pourquoi es-tu heureux
que je ressente des émotions ?
Perché sei così felice che io abbia un'anima?
Por que eu ter um coração
te deixa feliz?
Почему вас радует,
что у меня есть душа?