Kentaro's father is such a hard worker that most of the tenants at Maison Ikkoku didn't even know he existed. Unlike his wife, Mr. Ichinose is a very quiet man who loves his son very much, but doesn't have enough time to show him how much he cares. 

Maison Ikkoku is a romantic comedy series created by Rumiko Takahashi. The story centers around the development of the relationship between Kyoko Otonashi and Yusaku Godai. Kyoko is a recent widow who moves into the apartment house Ikkoku-kan where she becomes the manager. Godai is a wanna-be student ("ronin") struggling with college entrance exams. 
When they meet, it's love at first sight&mdash;for Godai anyway. Along the way, the other tentants, the mysterious Yotsuya, the seemingly alcoholic Ichinose, and the brash Akemi, watch and occasionally take part to make their lives more interesting. To complicate matters further, the wealthy tennis coach Shun Mitaka has his eye on Kyoko, while Godai is pursued by both Nanao Kozue and Ibuki Yagami. Covering a wide range of emotions from hysterically funny to painfully sad, Maison Ikkoku&mdash;all 96 episodes&mdash;is well worth seeing.

Campbell Lane was a Canadian actor who primarily did his work in Vancouver. He appeared in many television shows produced there, and was also a voice over artist. Campbell Lane died on January 30, 2014, from lung cancer, at the age of 78.

Robert Smith was a radio host, actor, and voice actor whose roles include Kaijinbo in InuYasha and Genma Saotome in Ranma ½. He died on June 1, 2010 due to pancreatic cancer and liver cancer. The "O" in his name was to distinguish him from other Robert Smiths, and does not represent anything.

Travel into Japan's nuttiest apartment house and meet its volatile inhabitants: Kyoko, the beautiful and mysterious new apartment manager; Yusaku, the exam-addled college student; Mrs. Ichinose, the drunken gossip; Kentaro, her bratty son; Akemi, the boozy bar hostess; and the mooching and peeping Mr. Yotsuya. Funny, touching, and a tad off-kilter, Maison Ikkoku is the great Rumiko Takahashi at her very best.
 
(Source: Viz Media)

Taking place after the tv-series, this movie tells the story of what happened with Godai, Kyoko and the tenants after the TV series ended (don't take the last episode in account, since that is a summary of what will come).

Ichinose-shi