On her way to school one morning, a boy from another school gives Himeno a love letter. The sudden turn of events has Himeno bewildered, and behind her bewilderment likes a traumatic memory from her childhood. What happened in Himeno's past? Himeno and Nozomi have come to Kyoko's house for a study meeting. As they're working, something strange happens...
I'm about to drill math, 
English, science, physics,
،سأقوم بحفر الرياضيّات 
،الإنجليزية، العلوم، الفيزياء
Ich werde jetzt Mathe
Englisch, Chemie, Physik
Te grabaré las Matemáticas,
Inglés, Ciencias, Física
Te grabaré las matemáticas,
inglés, ciencias, física
Les maths, l’anglais,
les sciences, la littérature…
Sto per ficcarti in quella testa matematica,
inglese, scienze, fisica e letteratura classica!
Agora vou perfurar seu ossos 
com matemática, inglês,
Я вобью тебе в голову математику, 
английский, естествознание,