因为长相比较文弱并不会被当成男性对待的初中男生椎名亚树，以进入初中为契机来到了东京，进入了学生公寓春原庄，而在春原庄里椎名亚树遇到了温柔的巨乳大姐姐管理员春原彩花，与同样住在春原庄的三名学姐雪本柚子、月见里堇、风间百合，以及管理员的妹妹黑皮辣妹春原菜菜。尽管是公寓中的唯一男性，但是在被女性包围的环境下，再加上椎名亚树的长相比较偏中性，所以并没有被当成是异性，甚至还有要求椎名亚树女装的情况。而黑皮辣妹春原菜菜初中时代担任学生会长学习成绩优秀，高中后才成为辣妹，还很喜欢亚树，为此和自己的姐姐彩花也有所竞争。
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