This is a shojo manga series with an anime adaptation.
Kippei Katakura is a lazy high-school playboy. He returns home one day to find that his sister has charged him with the upbringing of his five year old cousin Yuzuyu; this is because Miyako, Yuzuyu's mother, couldn't stand the stress of raising her as a single parent and (at least temporarily) can't handle being around Yuzuyu. Kippei then takes up the task with great gusto, and the series deals with his development as he cares for Yuzuyu.
The series alternates between Yuzuyu at pre-school, Kippei at high school, and their life together at home, and is chock full of heartwarming moments.
This series makes use of the following tropes:
- Abusive Parents - One plotline deals with this happening to one of Yuzuyu's friends at school, Shouta Nashiya, who's badly abused by his mom. Yuzuyu walks into Mrs. Nashiya beating Shouta and suffers an Heroic BSOD, which uncovers the whole situation to the school.
- Broken Bird - Miki
- Blue with Shock
- Character Development
- Cool Big Sis - Kippei's sister Reiko, mostly to Yuzuyu
- Chick Magnet - Kippei, especially with Yuzuyu in tow. It seems like half the female cast members have a crush on him. Something of a subversion, Kippei is shown to be completely aware of the girl's crushes and doesn't hesitate to take advantage of that, but the guy acts like he isn't aware of the Unfortunate Implications and is pretty much sincere in how he treats them.
- Children Raise You - the main premise of the series is to show how much Kippei changes after Yuzuyu comes into his life.
- Defrosting Ice Queen - Kokoro
- Drivento Suicide - Miki tries to either jump to her death (manga) or stab herself (anime).
- Father, I Want to Marry My Brother
- Fish out of Water - Kippei, who is initially unfamiliar with child-rearing
- Gratuitous English - in the OP
- Happily Married - Kippei's parents
- Idiot Ball - Much of the conflict in the beginning of the manga/anime results from Kippei leaving Yuzu alone on the way to pick her up from kindergarten, after picking her up or some variation thereof, e.g. 'Please wait here alone in the middle of the street while I take my own sweet time to buy some caramel sweets for you', to the point where Yuzu wises up and refuses to leave her class until Kippei shows up.
- Japanese Sibling Terminology
- Love Bubbles - used straight a lot, as this is a Shojo series
- Love Triangle - they don't last very long, however
- Malicious Slander - Ayumi is a victim of this.
- Missing Mom - A major plot point, and the basis of the story. This is because Miyako has been widowed recently, and has been in quite the a massive Heroic BSOD state ever since. Hence why she decides to leave Yuzu with Kippei.
- Official Couple - there's little doubt that Kippei and Kokoro will end up together by the first third of the show. Or by the first third of the Title Sequence.
- No Sense of Personal Space - Kippei in spades. Specifically, he tends to be really affectionate with girls without realizing that it raises flags all over the place.
- Parental Abandonment - Yuzuyu's mother Miyako
- Parent with New Paramour - Kokoro's father. She doesn't live with him and his new wife, but in a a rather nice apartment.
- Pick on Someone Your Own Size - Kippei's stalker who picks on Yuzuyu out of jealosy
- Single Woman Seeks Good Man - Kokoro doesn't give in to Kippei's advances until she realizes how good he is with Yuzuyu
- Slice of Life
- Spoiled Brat - Marika, at least until she gets some Character Development
- Squee! - In-Universe the girls in Kippei's school when Yuzuyu brings him his lunch
- Stalker with a Crush - Kippei's stalker who is Easily Forgiven despite traumatizing Yuzuyu by telling her that no one wants an abandoned orphan.
- The Stoic - Satsuki, Kippei's younger brother
- Those Two Guys - Kokoro's two friends, Aki and Motoki
- Third-Person Person - Yuzuyu talks like this, as she's only five
- Transfer Student Uniforms - there's an episode devoted to Yuzuyu having to switch to the new school's uniform