Maison Ikkoku - Hints and Cheats (translated from Japanese resources by filler)
http://projects.mattsmessyroom.com/maisonikkoku/

Don't just cheat! Try to solve it first!

Barrier 1: Ichinose-san in the manager's room

It's necessary to give 2 normal cup ramen or 1 bottle of sake to Ichnose-san 
in this case. If no matter what you say she resists leaving kanrinin-san's 
room it's necessary to please her as much as possible via the usual method in 
Ikkoku-kan. An fan of the original work knows what I am talking about? 
Ichinose-san's always carries around an armful of sake!

Barrier 2: Love rival Mitaka-san

Does the game capture the love rivalry between Mitaka and Godai? Mitaka is a 
difficult character. Obviously, unlike the tenants of Maison Ikkoku there are 
no items you can give him to change his mood. Instead you must think of things 
he does not like. Mitaka-san hates...that's right, dogs. There is one lying at 
the entrance of Maison Ikkoku that could be captured and brought to the room. 
By what does Soiuchiro-san like?

Easy Password

"Aaa..." fill up the first line with "a", then fill up the second line with "a" 
as much as the first. The game will start at the final part.

Start Half-way Password

To start on the second half of the game, on the password input screen put in 
over 17 "L's".

Package Infinite Supply

Enter the manager's room with less that 1000 yen. Call your parents from there, 
sit and you will get a package.Repeat this as much as you want.