Someone asked me a while ago about Love Revo (sorry it took so long!), and specifically about Ichinose Ren, whose route is the hardest to finish. I thought some general strategy might help – now this is from the PS2 version, but AFAIK it still applies:
1. The first month, spend as much time as possible on Research. Get it up to 100, it will make everything you do more effective.
2. Starting the first weekend in May(the second month), start inviting the guy on dates every week. Save and reload as many times as you need for them to agree – it will take several times at the beginning.
3. When it’s time for the guy to ask you to come along on his vacation (July 1), his heart should be green.
4. For Ichinose, you also need to be at least 90-95kg by that time.
5. Buy the CD of soothing music 『 ヒーリングミュージック集 』 ASAP – when you’re getting hungry, you can use it to reduce hunger without snacking. The sauna suit 『 頑丈なサウナスーツ 』 is also very effective – I think you can only buy it on the weekend.
Hope this helps!

Ren’s the hardest because he wants Hitomi to be anorexic!
I’m actually playing the game as we speak. I’m currently playing Wakatsuki sensei’s route. Honestly looking @ your tips here, it seems like it’s the same situation. I failed wakatsuki’s route 4 times because I didn’t harass him for dates/tea in his room every sunday and get his heart green by July 1st. It’s a pain in the butt but it seems like this is the best scenario to make sure you get your guys ending.
I follow like 3 japanese guide sites though when I play
Ha, I know – in real life Ren would be a total jerk!
But hey, someone needs to be the picky one to make things hard
And yes, those Sunday dates are crucial. Near the end it’s not a big deal, but getting to the summer vacation safely is a pain!