拓己是一位厨师，他看到了一则招聘广告而来到了“星际庄”。然而那里并不是一家餐厅，而是一间提供早餐的合租公寓（一栋两层木结构的公寓）。在那里，他与住户们一起享用了他现场制作的炸鲳鱼，看着他们美味地吃着，听着美丽的房东米拉说着“如果每天都能吃到这么美味的早餐，那生活就会很幸福”的话语和笑容，拓己被深深打动，决定成为“星际庄”的住宿厨师。然而就在这之后，他却发现了居民们隐藏的一面和米拉的秘密。

米菈和奈欧斯凯是从米波星球来到地球的外星人。而米菈之所以接下房东的工作，是因为她知道象征王位继承权的(钥匙)就藏在星际庄的某个地方。但是他们迟迟找不到钥匙放在哪里。在寻找的过程中，发生了早餐被偷吃事件。后来过了几小时，从学校回来的莲抓到一台神秘的扫地机器人，导致星际庄意外停电。害得米菈和拓己被关在密室里。

自称米菈未婚夫的男人、修因突然来到星际庄。而他其实是米菈的青梅竹马，而且长得非常帅。据说在故乡是从事自然能源相关的工作。看著米菈几乎每天都去和修因见面，让拓己的内心焦躁不已。另一方面，奈欧斯凯为了洗清扣在自己身上的偷吃早餐嫌疑，他开始寻找真正的犯人。结果某天，拓己为莲做的远足用便当再度消失！于是拓己重新做了一个便当，并和米菈一起急忙赶往莲身边。

为了找出偷吃早餐的犯人而装的监视器拍到了漆黑的阴影。那究竟是可疑人士，还是幽灵呢？看到不知所措的米菈来找他讨论对策，拓己决定实施一个用汤咖哩的香味引诱犯人出来的计划。但是，短短一瞬间，汤咖哩就被犯人偷走了！后来拓己等人透过奈欧斯凯的鼻子，循著味道找到她的藏身处。不过，奈欧斯凯指示的位置竟是墙壁。本以为是判断错误，然而当米菈敲了敲墙壁后，墙壁居然转动了！随之出现的，是一个无人知晓的空间。

The letter from Mira's mother tells all about her connection with Shimotakaido Tasuke, which leads the gang to try to learn more about him in earnest.

Takumi and Aoi head to the Insect Festival, only to be roped into an unexpected event supposedly involving the key Mira's looking for.

Ren is on the prowl for proof of Naosuke’s deception, and the Hubby spy is on the prowl for keys of all kinds! How will the gang navigate these two crises?

Takumi has no idea how to interact with Aoi after her outburst, and the Wakabayashi family have a falling-out.

As the Hubby attacks escalate, Shoin decides his presence on the scene is required. Meanwhile, a breaking news report leaves Teruko with doubts about her choices.

The gang finally finds a lead to the key! At the same time, it also means Mira’s departure is getting closer. How will Takumi and the other Astro Lodge residents react to the news?

Inspired by everyone's hard work, Yu makes a commitment to pursue her dream with equal vigor.