One day, Hanzaki Bakuya, a high school boy suffering from insomnia, meets a younger girl named Kobirimaki Kimitori, who is eating a delicious cup of yakisoba noodles in a park late at night. Then she says she will help Bakuya get a good night's sleep, and suddenly proposes that he come to her house!

"It's just like senpai to walk into a girl's room and suddenly take a smell of her scent."
"…Senpai. You're staring too much at my boobs."

And then, Kimitori-chan, who teases Bakuya whenever she gets the chance, whispers naughty words in his ear and spends a long night sleeping with him...! (MTL)

不眠症に悩む高校二年生・半崎獏也はある日、深夜の公園でカップ焼きそばをおいしそうに食べる後輩少女・小比類巻君鳥と出会う。獏也がぐっすり眠れるよう手伝いをすると言う彼女は、自分の家に来てほしいといきなり提案してきて！？
「女子の部屋に入って、いきなりクンクンと匂いを嗅ぐなんて流石先輩ですね」「……せーんぱい。おっぱい見過ぎです」と、隙あらば獏也をおちょくる君鳥ちゃんから耳元でエッチな言葉を囁かれたり添い寝したりと長い夜を過ごすことになり――！