Sorai Saki, point man of the RABBIT Squad at SRT Special Academy. She is a serious, rule-abiding girl who always carries her tactical manual with her, but her straightforward nature makes her inflexible, leaving her vulnerable to unexpected situations. One day, Schale-sensei, having seen through her personality, blindfolds and restrains Saki under the guise of “training to adapt to special battlefield environments.” ​ “This is part of the mission…” Saki tried to convince herself, but when the teacher’s fingertips began to relentlessly tease her sensitive inverted nipples, an unknown pleasure—unmentioned in the manual—overwhelmed her. The fear of the unknown and the sweet stimulation that aroused her shame. Though she initially resisted, repeated training caused her nipples to swell and harden, gradually becoming more sensitive. “Mmm…! The rules don’t allow this kind of training…!” Her protests gradually turned into sweet moans. Then, in the summer, they visited a scenic seaside spot together. Under the open sky, Saki, dressed in a swimsuit, was invited by her teacher. “Just this once…!” That was her excuse to herself. Behind rocks, in changing rooms, in the sea. Hiding from prying eyes, the two made love time and again. The girl who had once been bound by rules now sought out her teacher’s body of her own accord, etching the traces of their lewd union into the summer sun. There was no longer any hesitation in her expression; only the pleasure of depravity shone there.

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SRT特殊学園RABBIT小隊のポイントマン、空井サキ。常に戦術教範を持ち歩き、規則を重んじる真面目な性格の彼女だが、その実直さゆえに融通が利かず、想定外の事態に弱いという脆さを持っていた。ある日、彼女のその性格を見抜いたシャーレの先生は、「特殊な戦場環境への適応訓練」と称して、サキに目隠し拘束を施す。​ 「これも任務の一環だ…」。そう自分に言い聞かせるサキだったが、先生の指先が彼女の敏感な陥没乳首を執拗に弄り始めると、教範にはない未知の快感が彼女を襲う。見えない恐怖と、羞恥心を刺激する甘い刺激。最初は拒絶していたサキも、繰り返される調教によって乳首は大きく勃起し、開発されていく。「んっ…！規則に、こんな訓練は…！」。彼女の抗議は次第に甘い喘ぎ声へと変わっていった。 そして夏、先生と共に訪れた海辺の勝地。開放的な空の下、水着姿のサキは先生に誘われる。「一度だけだからな…！」。それは彼女自身への言い訳だった。岩陰、更衣室、海の中。人目を忍びながら、二人は何度も体を重ねる。かつて規範に縛られていた少女は、今や自ら先生の体を求め、真夏の太陽の下で淫らな交合の痕跡を刻み込んでいく。その表情には、もはや迷いなどなく、ただ堕落の快楽だけが輝いていた。​