Mizuhara has lost the key to her apartment and comes to Kazuya for some reason... and she's not the only unexpected visitor!
I'll give you two hints. 
"Naked" and "Sleepover."
"سأعطيكِ تلميحين، "عارية" و"مبيت
Lass mich dich einweihen:
Te doy dos pistas:
"Sin ropa" y "Dormir".
Te doy dos pistas:
"Sin ropa" y "Dormir".
Je te donne deux indices.
« Nue » et « dormir chez toi ».
Gli indizi sono verme e notte.
Darei duas dicas. "Pelada" e "Dormir".
Подсказки: ночёвка и головка черепахи.