My Classmate Is My Dad's Bride. But in Bed She's Mine.

The school idol is my stepmother ?! Under the same roof, living together with her begins. My unrequited love, Erika, appears before my eyes saying that she has become my father's wife. A sudden start from the first day of my new life leading to a series of events..! Note: Originally serialized as a web manga under the title Doukyuusei wa Oyaji no Yome. Bed no Ue de wa Ore no Yome. (同級生は親父の嫁。ベッドの上では俺の嫁。). Each chapter is split into 3 ‘episodes’ in the English serialization.