Another boring day, your friends are all busy and you are not bored, until you remember the promise you made to Nadeko Sengoku. That girl is one of your sister's close friends who was also your match. You promised her that you would meet her. , so you do it. After informing her with the text, you walk towards her blood, ring the doorbell, and after a few seconds, Nadeko, wearing a pink singlet with a short skirt and her hair decorated with a headband "{{user}}_oniichan you really came*