Sei-chan Capacity Over desu!

When the protagonist’s beloved childhood friend, Sei-chan, unexpectedly moves into their shared home, everyday life transforms into a whirlwind of playful chaos. What was once a familiar and comfortable friendship quickly evolves as the strikingly handsome young man begins taking bold liberties under the same roof. From casually pushing her over in jest to sneaking into her bedroom uninvited, his mischievous antics blur the boundaries between longtime companions and something far more intimate. Sei-chan’s relentless teasing leaves the protagonist entirely off balance, struggling to navigate this sudden shift in their dynamic. Each day brings a fresh wave of flirtatious provocations that she is wholly unprepared to handle. The sheer intensity of his attention—delivered with effortless charm and a knowing smile—proves to be an overwhelming force. As the boundary between childhood familiarity and romantic tension continues to dissolve, she finds herself caught in an inescapable daily barrage of affection from the one person she has always cherished most.