The train fare for dates, the amount you spend on coffee as a short breather, elegant dinners, anniversary​ presents, fine restaurants and hotels... Love costs money. But this is unexpectedly normal when it comes to love, and there is no concept of "borrows and loans." Lend out money and borrow love in return. Lend out love and borrow money. Taiga and Hitsuji genuinely love for each other, but their love life includes "borrows and loans."