No seriously, 20 minutes on an exercise bike watching ONE episode of anime per day, and it is likely you will be in the negative calorie range, supposing you aren't eating ridiculously wrong. You can usually eat what you want, as long as you keep in mind the portions of what you are eating. Most of your meals should be based on something healthy, but if you want to have something unhealthy on the side, it is usually fine.
Cut down on eating, instead of eating large meals, eat more meals that are smaller in size and better portioned. Weaboo? LOSE THE RAMEN NOODLES. They are SHIT. Get rice noodles, they are microwaveable. Get steamed vegetables, and put a lot in your rice noodles. I am guessing I am eating only about 1700 calories per day. Mix that in with biking 20 minutes a day, and you are almost certainly losing weight.
Also, weights are important. The more muscle mass you have, the higher your metabolism, the easier it is to stay a healthy weight. Also, muscle lets you fuck people up, making people more apt to listen to you. I mean, besides being attractive and all that.