ヤンデレ日記 is a free lifestyle app developed by Keisuke Tanaka for iPhone users. This app is specifically designed for individuals who are deeply and obsessively in love with someone and need a platform to express their feelings and record their daily experiences.

With ヤンデレ日記, users can input their emotions and thoughts about their beloved one into a heart-shaped section of the app. The left side of the heart represents the level of affection, while the right side indicates the level of obsession. This allows users to create their own unique heart that reflects their intense emotions.

Additionally, the app provides a diary feature where users can write about their daily experiences with their beloved one. Whether it's a happy or difficult day, users can document their most precious emotions and memories.

However, it's important to note that the app discourages excessive communication with the loved one, as it may have a negative impact on the relationship. Instead, users are encouraged to express their feelings through the app's chat feature, providing a sense of comfort and support.

ヤンデレ日記 offers a safe space for individuals to preserve their intense emotions and keep a record of their cherished feelings. It is an ideal app for those who find solace in expressing their love and emotions in a unique and personal way.